Lens Device

ABSTRACT

A lens device includes a first lens module, a first light path turning module and an image sensor. The first lens module, the first light path turning module and the image sensor are sequentially arranged along a light path in which a light beam propagates. The first light path turning module is configured to change a direction in which the light beam propagates so that the light beam passes through the first lens module to form an image on the image sensor.

BACKGROUND OF THE INVENTION Field of the Invention

The invention relates to a lens device, and more particularly to a lensdevice and a voice coil motor thereof.

Description of the Related Art

Currently many portable electronic devices are provided with lensdevices. FIG. 1 is a schematic diagram showing a lens device 1100 of theprior art. As shown in FIG. 1, the lens device 1100 includes a lightpath turning module 1101, a lens module 1102 and an image sensor 1103.The lens module 1102 includes a plurality of lens units (not shown) andan optical axis extending in a first direction X. The light path turningmodule 1101, the lens module 1102 and the image sensor 1103 are arrangedin the first direction X. In operation, a light beam propagates in asecond direction Y, enters the light path turning module 1101, isreflected by the light path turning module 1101 to propagate in thefirst direction X, and reaches the image sensor 1103 to form an image.The second direction Y is perpendicular to the first direction X.

The lens device 1100 has the following drawbacks: the light path turningmodule 1101, the lens module 1102 and the image sensor 1103 are arrangedin the first direction X. When the optical zoom in high magnification isrequired, the effective focal length (EFL) of the lens device must belarge so that the length of the lens device 1100 is large. That isdisadvantageous to miniaturization of the portable electronic devices.With the development of portable electronic devices, the lens device1100 requires a new layout in internal structure to suit the portableelectronic devices.

FIG. 2 is a schematic diagram showing another lens device 2500 of theprior art. As shown in FIG. 2, the lens device 2500 includes a base (notshown), a prism module 2501, a lens module 2502 and an image sensor2503. The prism module 2501 is configured to change the direction ofpropagation of a light beam from the direction Y to the direction X byreflection. The lens module 2502 is configured to receive the light beamfrom the prism module 2501. The light beam exits from the lens module2502 and reaches the image sensor 2503 to form an image.

The lens device 2500 has the following drawbacks: due to the trend ofincrement of the effective focal length of the lens unit of the lensmodule 2502, the image sensor 2503 needs to be disposed farther from thelens module 2502 so that the lens device 2500 will be too long.

FIG. 3 is a schematic diagram showing anther lens device 3100 of theprior art. As shown in FIG. 3, the lens device 3100 includes a lightpath turning module 3101, a lens module 3102 and an image sensor 3103.The light path turning module 3101 is configured to change the directionof propagation of a light beam from the direction Y to the direction Xby reflection. The lens module 3102 includes a plurality of lens unitsand an optical axis extending in the direction X. The light beam exitsfrom the lens units 3102 and reaches the image sensor 3103 to form animage.

The lens device 3100 is only suitable for an electronic device with lowmagnification and fails to provide an operation of multi-magnifications.

A voice coil motor (VCM) is a device for converting electrical energyinto mechanical energy and for outputting a linear motion and a limitedoscillation. A known lens device (e.g. periscope lens) generallyincludes a prism module, a lens module and an image sensor. When theoptical zoom in high magnification is required, the effective focallength must be large so that the length of the lens module is large.That is disadvantageous to miniaturization of the electronic device.

BRIEF SUMMARY OF THE INVENTION

An object of the invention is to provide a lens device with a new layoutin structure to effectively reduce the length of the lens device.

Another object of the invention is to provide a lens device capable ofan operation of multi-magnifications, an optical zoom in highmagnification, and miniaturization of the lens module.

Another object of the invention is to provide a lens device and aminiaturized voice coil motor capable of an optical zoom in highmagnification and stabilization of structure.

Another object of the invention is to provide a lens device without thetechnical problem of impacts and the frictional forces required to beovercome, arising from the slider used in a known voice coil motor.

The lens device in accordance with an exemplary embodiment of theinvention includes a first lens module, a first light path turningmodule and an image sensor. The first lens module, the first light pathturning module and the image sensor are sequentially arranged along alight path in which a light beam propagates. The first light pathturning module is configured to change a direction in which the lightbeam propagates so that the light beam passes through the first lensmodule to form an image on the image sensor.

In another exemplary embodiment, the lens device further includes asecond light path turning module, wherein the first lens module has anoptical axis oriented in a first direction; the second light pathturning module is configured to receive the light beam propagates in asecond direction and to reflect the light beam to the first lens modulein the first direction; the first light path turning module is disposedbetween the first lens module and the image sensor, and includes a firstprism unit and a second prism unit; the first prism unit includes afirst surface, a second surface and a third surface; the light beam isincident into the first prism unit through the first surface; the secondsurface is disposed opposite to the image sensor; the light beam istotally reflected in the first prism unit and exits from the secondsurface; the second prism unit includes a fourth surface and a fifthsurface, the fourth surface is disposed opposite to the first lensmodule, the fifth surface is disposed opposite to the first surface, andthe fifth surface and the first surface are spaced.

In yet another exemplary embodiment, the first light path turning moduleincludes a first reflecting part and a second reflecting part, the firstreflecting part is disposed between the first lens module and the imagesensor, the first reflecting part includes a first reflecting cathetussurface, a second reflecting cathetus surface and a first hypotenusesurface, the second reflecting part is disposed between the firstreflecting part and the first lens module, the second reflecting partincludes a third reflecting cathetus surface, a fourth reflectingcathetus surface and a second hypotenuse surface, the second reflectingpart is configured to move parallel to the second hypotenuse surface forcompensation for hand wobbling, and the second reflecting part isconfigured to move perpendicular to the second hypotenuse surface foradjustment of focal length of the lens device.

In another exemplary embodiment, the lens device further includes abase, a third light path turning module, a second light path turningmodule, a second lens module and a driving unit. The third light pathturning module is configured to reflect the light beam so that thedirection of propagation of the light beam is changed from a seconddirection to a first direction. The second light path turning module isconfigured to reflect the light beam so that the direction ofpropagation of the light beam is changed from the second direction tothe first direction. The second lens module is configured to receive thelight beam reflected by the third light path turning module and has asecond optical axis oriented in the first direction. The first lensmodule is configured to receive the light beam reflected by the secondlight path turning module and has a first optical axis oriented in thefirst direction. The first light path turning module is configured toreflected the light beam from the first lens module to the image sensor.The third light path turning module, the second lens module, the secondlight path turning module, the first lens module, the first light pathturning module and the image sensor are sequentially disposed on thebase along the light path. The second light path turning module isswitched between a first position and a second position, and the firstdirection and the second direction are perpendicular to each other. Thelight beam from the second lens module is blocked by the second lightpath turning module when the second light path turning module is in thefirst position, and the second light path turning module is deviatedfrom the second optical axis allowing the light beam from the secondlens module to enter the first lens module when the second light pathturning module is in the second position. The driving unit is configuredfor driving the second light path turning module to move in a thirddirection and to stay in the first position or the second position. Thefirst direction, the second direction and the third direction areperpendicular to each other.

In yet another exemplary embodiment, the first lens module has anoptical axis oriented in a first direction; the first light path turningmodule includes a first reflecting part and a second reflecting part;the first reflecting part is configured to receive and reflect the lightbeam passing through the first lens module; the first reflecting part isdisposed between the first lens module and the image sensor and ismovable in a third direction perpendicular to the first direction; thesecond reflecting part is configured to reflect the light beam comingfrom the first reflecting part; the second reflecting part is disposedbetween the first lens module and the image sensor and is movable alongwith the first reflecting part in same or opposite directions. b

In another exemplary embodiment, the first lens module has an opticalaxis oriented in a first direction; the first light path turning moduleincludes a first reflecting part, a second reflecting part and a thirdreflecting part; the first reflecting part is configured to receive andreflect the light beam passing through the first lens module; the firstreflecting part is disposed between the first lens module and the imagesensor and is movable in the first direction; the second reflecting partis configured to reflect the light beam coming from the first reflectingpart; the second reflecting part is disposed between the first lensmodule and the image sensor and is movable along with the firstreflecting part in same or opposite direction; the third reflecting partis configured to reflect the light beam, coming from the firstreflecting part, to the first reflecting part; the third reflecting partis disposed between the first lens module and the image sensor.

In yet another exemplary embodiment, the lens device further includes afirst reflecting module, a second reflecting module, a rolling unit anda first mount. The first reflecting module includes a first reflectingpart and a first carrier, and the first reflecting part is disposed onthe first carrier. The second reflecting module includes a secondreflecting part and a second carrier, and the second reflecting part isdisposed on the second carrier. The rolling unit includes a roller.Either the first carrier or the first mount has a first receiving groovefor positioning the roller, the first carrier further has a first guidegroove extending in a direction of movement of the first carrier whenthe first mount has the first receiving groove, or the first mountfurther has the first guide groove extending in the direction ofmovement of the first carrier when the first carrier has the firstreceiving groove. Either the second carrier or the first mount has asecond receiving groove for positioning the roller, the second carrierfurther has a second guide groove extending in a direction of movementof the second carrier and corresponding to the second receiving groovewhen the first mount has the second receiving groove, or the first mountfurther has the second guide groove extending in the direction ofmovement of the second carrier and corresponding to the second receivinggroove when the second carrier has the second receiving groove.

In another exemplary embodiment, the lens device further includes adriving unit. The first light path turning module includes a firstreflecting module and a second reflecting module. The second reflectingmodule is configured to reflect the light beam coming from the firstreflecting module. The driving unit is configured to drive the firstreflecting module and the second reflecting module to move in same oropposite direction. The driving unit includes a mount, a first drivingassembly and a second driving assembly, and the first driving assemblyand a second driving assembly are configured to drive the firstreflecting module and the second reflecting module which are movablydisposed on the mount. The first driving assembly includes a firstslider mechanism, and the first slider mechanism is firmly connected tothe first reflecting module. The second driving assembly includes asecond slider mechanism, and the second slider mechanism is firmlyconnected to the second reflecting module. The first slider mechanismand the second slider mechanism are slidably connected to the mount. Thedriving unit further includes a shaft firmly connected to the mount, andthe first slider mechanism and the second slider mechanism are disposedaround the shaft.

In yet another exemplary embodiment, the first driving assembly includesa first magnet, a first printed circuit unit and a first attractingyoke; the first magnet is disposed on the mount while the first printedcircuit unit and the first attracting yoke are disposed on the firstreflecting module; alternatively, the first magnet is disposed on thefirst reflecting module while the first printed circuit unit and thefirst attracting yoke are disposed on the mount; the second drivingassembly includes a second magnet, a second printed circuit unit and asecond attracting yoke; the second magnet is disposed on the mount whilethe second printed circuit unit and the second attracting yoke aredisposed on the second reflecting module; alternatively, the secondmagnet is disposed on the second reflecting module while the secondprinted circuit unit and the second attracting yoke are disposed on themount; the first printed circuit unit includes a first coil and a firstcircuit board, and the first coil is printed on a surface of the firstcircuit board opposite to the first magnet; the second printed circuitunit includes a second coil and a second circuit board, and the secondcoil is printed on a surface of the second circuit board opposite to thesecond magnet; the first printed circuit unit includes a first drivingchip and a first chip cooler mounted on another surface of the firstcircuit board; the second printed circuit unit includes a second drivingchip and a second chip cooler mounted on another surface of the secondcircuit board.

In another exemplary embodiment, the lens device further includes asecond light path turning module, a second lens module and a drivingunit. The second light path turning module is switched between a firstposition and a second position. The second lens module has a secondoptical axis oriented in the first direction. The light beam from thesecond lens module is blocked by the second light path turning modulewhen the second light path turning module is in the first position, andthe second light path turning module is deviated from the second opticalaxis allowing the light beam from the second lens module to enter thefirst lens module when the second light path turning module is in thesecond position. The driving unit is configured to rotate the secondlight path turning module to reach the first position or the secondposition.

In yet another exemplary embodiment, the lens device further includes afirst mount, a first driving unit, two rolling units and a second lightpath turning module, wherein the first light path turning moduleincludes a first reflecting module and a second reflecting module; thesecond reflecting module is configured to reflect the light beam comingfrom the first reflecting module; the first driving unit is configuredto drive the first reflecting module and the second reflecting module tomove on the first mount in same or in two opposite directions; the firstreflecting module and the second reflecting module are connected to thefirst mount through the rolling units; the second light path turningmodule is configured to reflect the light beam from an object side andincludes a third reflecting part, a third carrier, a second mount and asecond driving unit; the third reflecting part is configured to reflectthe light beam from an object side; the third carrier is configured tocarry the third reflecting part; the third carrier is mounted on thesecond mount, is rotatable with respect to the second mount via a shaft,and is fixed to the shaft; the shaft includes two ends connected to thesecond mount; the second driving unit is configured to drive the thirdcarrier to rotate.

In another exemplary embodiment, the first light path turning moduleincludes a plurality of reflecting parts configured to reflect the lightbeam a plurality of times and to form the image on the image sensor; thefirst lens module has an optical axis oriented in a first direction; theimage sensor is disposed on a plane; the plane and the optical axis arearranged in parallel or intersected at an angle differing from ninetydegrees.

In yet another exemplary embodiment, the first light path turning moduleincludes a plurality of reflecting parts configured to reflect the lightbeam a plurality of times and to form the image on the image sensor; thefirst lens module has an optical axis oriented in a first direction; theimage sensor is disposed on a plane; the plane and the optical axis areperpendicular to each other; the first lens module partly or totallycovers the image sensor when observed in the first direction.

In another exemplary embodiment, the first light path turning moduleincludes a first prism unit; the first prism unit includes a firstsurface, a second surface and a third surface; the light beam enters thefirst prism unit through the first surface, is totally reflected in thefirst prism unit at least three times, and leaves the first prism unitfrom the second surface and perpendicular to the second surface; thefirst surface is perpendicular to an optical axis of the first lensmodule, the first surface meets the second surface at a first angleranged from 42.75° to 47.25°,the second surface meets the third surfaceat a second angle ranged from 64.125° to 70.875°,and the first surfacemeets the third surface at a third angle ranged from 64.125° to 70.875°.

In yet another exemplary embodiment, the first light path turning moduleincludes a first prism unit and a second prism unit; the first prismunit includes a first surface, a second surface and a third surface; thesecond prism unit includes a fourth surface, a fifth surface and a sixthsurface; the fourth surface is disposed opposite to the first lensmodule; the fifth surface and the first surface are spaced and disposedopposite to each other; the third surface is coated with a reflectingfilm and is inclined towards the lens module; the light beam passesthrough the second prism unit and then the first prism unit, is totallyreflected in the first prism unit, and leaves the first prism unit fromthe second surface and perpendicular to the second surface; the secondsurface meets the third surface at a first angle ranged from 85.5° to94.5°,the first surface meets the second surface at a second angleranged from 47.5° to 52.5°,the first surface meets the third surface ata third angle ranged from 38° to 42°,the fourth surface meets the fifthsurface at a fourth angle ranged from 28.5° to 31.5°,and the fifthsurface meets the sixth surface at a fifth angle ranged from 57° to 63°.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a schematic diagram showing a lens device of the prior art.

FIG. 2 is a schematic diagram showing another lens device of the priorart.

FIG. 3 is a schematic diagram showing a periscope lens of the prior art.

FIG. 4 is a schematic diagram showing the structure of a lens device inaccordance with a first embodiment of the invention.

FIG. 5 is an exploded diagram of the lens device of the first embodimentof the invention.

FIG. 6 depicts the optical path of the lens device of the firstembodiment of the invention.

FIG. 7 is a schematic diagram showing the structure of a lens device inaccordance with a second embodiment of the invention.

FIG. 8 is an exploded diagram of the lens device of the secondembodiment of the invention.

FIG. 9 is a top view of the lens device of the second embodiment of theinvention.

FIG. 10 depicts the optical path of the lens device of the secondembodiment of the invention.

FIG. 11A is a schematic diagram of a reflecting part in accordance withthe invention.

FIG. 11B is another schematic diagram of the reflecting part inaccordance with the invention.

FIG. 12A is a schematic diagram showing a lens device in accordance witha third embodiment of the invention.

FIG. 12B depicts the optical path of the lens device of the thirdembodiment of the invention.

FIG. 12C depicts the optical path of the lens device of the thirdembodiment of the invention when the reflecting part is moved along anX-axis.

FIG. 12D depicts the optical path of the lens device of the thirdembodiment of the invention when the reflecting part is moved along aY-axis.

FIG. 13A is a schematic diagram showing a lens device in accordance witha fourth embodiment of the invention.

FIG. 13B depicts the optical path of the lens device of the fourthembodiment of the invention.

FIG. 13C depicts the optical path of the lens device of the fourthembodiment of the invention when the first reflecting part is movedalong an X-axis.

FIG. 13D depicts the optical path of the lens device of the fourthembodiment of the invention when the first reflecting part is movedalong a Y-axis.

FIG. 14A is a schematic diagram showing a lens device in accordance witha fifth embodiment of the invention.

FIG. 14B depicts the optical path of the lens device of the fifthembodiment of the invention.

FIG. 14C depicts the optical path of the lens device of the fifthembodiment of the invention when the second reflecting part is movedalong an X-axis.

FIG. 14D depicts the optical path of the lens device of the fifthembodiment of the invention when the second reflecting part is movedalong a Y-axis.

FIG. 14E depicts the optical path of the lens device of the fifthembodiment of the invention when the second reflecting part is rotatedabout a Z-axis.

FIG. 14F depicts the optical path of the lens device of the fifthembodiment of the invention when the first reflecting part is movedalong an X-axis.

FIG. 14G depicts the optical path of the lens device of the fifthembodiment of the invention when the first reflecting part is movedalong a Y-axis.

FIG. 15 is a schematic diagram showing the structure of a periscope lensin accordance with a sixth embodiment of the invention, wherein thesecond light path turning module is in a first position.

FIG. 16 is a top view of the periscope lens of FIG. 15.

FIG. 17 is a side view of the periscope lens of FIG. 15.

FIG. 18 is a schematic diagram showing the structure of the periscopelens of the invention wherein the second light path turning module is ina second position.

FIG. 19 is a top view of the periscope lens of FIG. 18.

FIG. 20 is a side view of the periscope lens of FIG. 18.

FIG. 21 is a schematic diagram showing a periscope lens in accordancewith a seventh embodiment of the invention, wherein the second lightpath turning module is in the second position.

FIG. 22 is a top view of the periscope lens of FIG. 21.

FIG. 23 is a side view of the periscope lens of FIG. 21.

FIG. 24 is a schematic diagram showing the structure of the primaryelements of a lens device in accordance with an eighth embodiment of theinvention.

FIG. 25 is a schematic diagram showing the light path of the lens deviceof the eighth embodiment of the invention.

FIG. 26 is a schematic diagram showing the light path of the lens deviceof the eighth embodiment of the invention wherein the first reflectingpart and the second reflecting part are moved in opposite directionsincluding the third direction and the opposite direction thereof.

FIG. 27 is a schematic diagram showing the light path of the lens deviceof the eighth embodiment of the invention wherein the first reflectingpart and the second reflecting part are moved in the same directionincluding the third direction or the opposite direction thereof.

FIG. 28 is a schematic diagram showing another structure of the primaryelements of a lens device in accordance with the eighth embodiment ofthe invention.

FIG. 29 is a top view of the elements of the lens device of FIG. 25.

FIG. 30 is an exploded diagram of the elements of the lens device ofFIG. 25.

FIG. 31 is another exploded diagram of the elements of the lens deviceof FIG. 25.

FIG. 32 is a schematic diagram showing the optical path of a lens devicein accordance with a ninth embodiment of the invention.

FIG. 33 is a schematic diagram showing the light path of the lens deviceof the ninth embodiment of the invention, wherein the first reflectingpart and the second reflecting part are moved in opposite directionsincluding the first direction and the opposite direction thereof.

FIG. 34 is a schematic diagram showing the light path of the lens deviceof the ninth embodiment of the invention, wherein the first reflectingpart and the second reflecting part are moved in the same directionincluding the first direction or the opposite direction thereof.

FIG. 35 is an exploded diagram of a voice coil motor in accordance witha tenth embodiment of the invention, with the frame thereof removed.

FIG. 36 is a perspective diagram showing the voice coil motor inaccordance with the tenth embodiment of the invention.

FIG. 37 is a perspective diagram showing the first reflecting module andthe second reflecting module in accordance with the tenth embodiment ofthe invention.

FIG. 38 is an exploded diagram of the voice coil motor in accordancewith the tenth embodiment of the invention.

FIG. 39 is an exploded diagram of a driving unit in accordance with thetenth embodiment of the invention.

FIG. 40 is a perspective diagram showing the first reflecting module andthe first driving module in accordance with the tenth embodiment of theinvention.

FIG. 41 is an exploded diagram showing the first reflecting module andthe first driving module in accordance with the tenth embodiment of theinvention.

FIG. 42 is a top view of the first reflecting module and the firstdriving module in accordance with the tenth embodiment of the invention.

FIG. 43 is a section of FIG. 42 along A-A.

FIG. 44 is a perspective diagram showing a first printed circuit unit, asecond printed circuit unit and a mount in accordance with the tenthembodiment of the invention.

FIG. 45 is another perspective diagram showing the first printed circuitunit, the second printed circuit unit and the mount in accordance withthe tenth embodiment of the invention.

FIG. 46 is a perspective diagram of a lens device in accordance with aneleventh embodiment of the invention.

FIG. 47 is a schematic diagram showing the structure of the lens deviceof the invention.

FIG. 48 is an exploded diagram of a voice coil motor in accordance witha twelfth embodiment of the invention.

FIG. 49 is a schematic diagram showing an assembly of a first reflectingmodule and a second reflecting module of the voice coil motor inaccordance with the twelfth embodiment of the invention.

FIG. 50 is a schematic diagram showing the second reflecting module ofthe voice coil motor in accordance with the twelfth embodiment of theinvention.

FIG. 51 is a schematic diagram showing the first mount of the voice coilmotor in accordance with the twelfth embodiment of the invention.

FIG. 52 is an exploded diagram showing the first mount of the voice coilmotor in accordance with the twelfth embodiment of the invention.

FIG. 53 is an exploded diagram showing the first driving unit of thevoice coil motor in accordance with the twelfth embodiment of theinvention.

FIG. 54 is a schematic diagram showing the second light path turningmodule in accordance with a thirteenth embodiment of the invention.

FIG. 55 is an exploded diagram showing the second light path turningmodule in accordance with a first technical solution of the thirteenthembodiment of the invention.

FIG. 56 is an exploded diagram showing the second light path turningmodule in accordance with a second technical solution of the thirteenthembodiment of the invention.

FIG. 57 is an exploded diagram showing the second light path turningmodule in accordance with a third technical solution of the thirteenthembodiment of the invention.

FIG. 58 is an exploded diagram showing the second light path turningmodule in accordance with a first technical solution of a fourteenthembodiment of the invention.

FIG. 59 is an exploded diagram showing the second light path turningmodule in accordance with a second technical solution of the fourteenthembodiment of the invention.

DETAILED DESCRIPTION OF THE INVENTION

The invention can be more fully understood by reading the subsequentdetailed description and embodiments with references made to theaccompanying drawings. However, it is understood that the subsequentdetailed description and embodiments are only used for explaining theinvention. The invention is not limited thereto.

FIG. 4 is a schematic diagram showing the structure of a lens device1200 in accordance with a first embodiment of the invention. FIG. 5 isan exploded diagram of the lens device 1200 of the first embodiment ofthe invention. FIG. 6 depicts the optical path of the lens device 1200of the first embodiment of the invention. Referring to FIGS. 4-6, thelens device 1200 in accordance with the first embodiment of theinvention includes a second light path turning module 1201, a first lensmodule 1202, a first light path turning module 1203 and an image sensor1204. The first lens module 1202 includes a plurality of lens units (notshown) and has an optical axis oriented in a first direction X.

The second light turning module 1201, the first lens module 1202, thefirst light path turning module 1203 are arranged in the first directionX. In operation, a light beam propagates in a second direction Y, entersthe second light path turning module 1201, is reflected by the secondlight path turning module 1201 to propagate in the first direction X,enters the first lens module 1202, and propagates in the first directionX to reach the first light path turning module 1203. The seconddirection Y is perpendicular to the first direction X.

The second light path turning module 1201 includes a light path turningunit mount 12011, a light path turning unit carrier (not shown) disposedin the light path turning unit mount 12011, and a light path turningunit 12012 fixed to the interior of the light path turning unit carrier.The light path turning unit 12012 may be a prism unit or a reflectingmirror. The light path turning unit 12012 has a reflecting surface forreflecting the light beam, coming from the second direction Y, to thefirst lens module 1202.

The first lens module 1202 includes a lens unit mount 12021, a lens unithaving an optical axis oriented in the first direction X, a primary lensunit carrier configured to carry the lens unit, and a secondary lensunit carrier configured to receive the primary lens unit carrier andconnected to the lens unit mount 12021. The primary lens unit carrier ismovable with respect to the secondary lens unit carrier in at least oneof the first direction X, the second direction Y and a third directionZ. The secondary lens unit carrier is movable with respect to the lensunit mount 12021 in a direction(s) other than the direction(s) in whichthe primary lens unit carrier is moved. The first lens module 1202further includes driving elements for driving the primary lens unitcarrier to move with respect to the secondary lens unit carrier and fordriving the secondary lens unit carrier to move with respect to the lensunit mount 12021, in order to perform the focusing operation in thefirst direction X and to compensate for hand wobbling in the seconddirection Y and the third direction Z. The third direction Z isperpendicular to the first direction X and the second direction Y.

However, the invention is not limited thereto. In another embodiment,the first lens module 1202 is configured to perform the focusingoperation in the first direction X and to compensate for hand wobblingin the second direction Y or in the third direction Z. That is, thecompensation for hand wobbling can be only performed in a singledirection.

The first light path turning module 1203 is disposed between the firstlens module 1202 and the image sensor 1204 and includes a first prismunit 12031 and a prism unit mount (not shown) for fixing the first prismunit 12031. The first prism unit 12031 includes a first surface 12031 a,a second surface 12031 b and a third surface 12031 c. The first prismunit 12031 may be a triangular prism. The first surface 12031 a isopposite to the first lens module 1202, while the second surface 12031 bis opposite to the image sensor 1204.

The light beam, exiting from the first lens module 1202, enters thefirst prism unit 12031 through the first surface 12031 a. Preferably,the first surface 12031 a is perpendicular to the first direction X. Thelight beam passes through the first surface 12031 a. The second surface1231 b is inclined towards the first lens module 1202. The light beam,entering the first prism unit 12031, is totally reflected on the secondsurface 1231 b due to the incident angle greater than the criticalangle, and reaches the third surface 12031 c. The third surface 12031 cis coated with a reflecting film to reflect the light beam. The lightbeam is reflected to the first surface 12031 a by the third surface12031 c, is totally reflected on the first surface 12031 a due to theincident angle greater than the critical angle, passes through thesecond surface 12031 b, and reaches the image sensor 1204 to form animage. Preferably, the light beam, after reflected on the first surface12031 a, is perpendicularly incident on the second surface 1231 b. Thefirst surface 12031 a and the second surface 1231 b are arranged inaccordance with Snell's law. Refraction is the change in direction of alight beam passing from one medium to another medium, wherein the twomedia have different refractive indices. If a light beam is incidentfrom a medium of higher refractive index to a medium of lower refractiveindex and the incident angle is greater than the critical angle, thenthe light beam will be totally reflected back to the medium of higherrefractive index without any refraction. That is, there is no refractedlight beam but reflected light beam, which is named the totalreflection. The critical angle is the smallest angle of incidence thatyields total reflection. According to the above-mentioned opticalphenomenon, the light beam entering the first prism unit 12031 in thefirst direction X and being reflected on the third surface 12031 c tothe first surface 12031 a is totally reflected rather than passesthrough the first surface 12031 a. The first prism unit 12031 may be atotal reflection prism.

The first surface 12031 a is perpendicular to the optical axis of thefirst lens module 1202 (or the first direction X). The first surface12031 a meets the second surface 1231 b at an angle ranged from 42.75°to 47.25°. The second surface 1231 b meets the third surface 12031 c atan angle ranged from 64.125° to 70.875°. The third surface 12031 c meetsthe first surface 12031 a at an angle ranged from 64.125° to 70.875°.Preferably, the first surface 12031 a is perpendicular to the firstdirection X. The first surface 12031 a meets the second surface 1231 bat 45°. The second surface 1231 b meets the third surface 12031 c at67.5°. The third surface 12031 c meets the first surface 12031 a at67.5°. Such arrangement ensures that the light beam propagates inaccordance with the above-mentioned path. However, the invention is notlimited thereto. Other proper angles may be used in the invention.

The image sensor 1204 includes an image forming unit 12041 which isparallel to the second surface 1231 b.

FIG. 7 is a schematic diagram showing the structure of a lens device1300 in accordance with a second embodiment of the invention. FIG. 8 isan exploded diagram of the lens device 1300 of the second embodiment ofthe invention. FIG. 9 is a top view of the lens device 1300 of thesecond embodiment of the invention. FIG. 10 depicts the optical path ofthe lens device 1300 of the second embodiment of the invention.Referring to FIGS. 7-10, the lens device 1300 in accordance with thesecond embodiment of the invention includes a second light path turningmodule 1301, a first lens module 1302, a first light path turning module1303 and an image sensor 1304. The first lens module 1302 includes aplurality of lens units (not shown) and has an optical axis oriented ina first direction X.

From the above embodiments, it is understood that the lens device of theinvention has a layout different from the prior art. Therefore,application of the lens device of the invention for various electronicequipments which are in rapid development is more flexible.

Referring to FIG. 11A, the lens device of the invention includes a firstreflecting part 210. The first reflecting part 210 has a firstreflecting cathetus surface 211, a second reflecting cathetus surface212 and a hypotenuse surface 213, wherein the first reflecting cathetussurface 211 and the second reflecting cathetus surface 212 areperpendicular to each other. The hypotenuse surface 213 is configuredfor allowing light beams to pass through. In FIG. 11A, the firstreflecting cathetus surface 211, the second reflecting cathetus surface212 and the hypotenuse surface 213 are shown in solid lines when thefirst reflecting part 210 is in an initial position. The firstreflecting cathetus surface 211, the second reflecting cathetus surface212 and the hypotenuse surface 213 are shown in broken lines when thefirst reflecting part 210 is moved rightwards (parallel to thehypotenuse surface 213, in a −Z direction) at a distance L to a firstposition. If the first reflecting part 210 is moved from the initialposition to the first position in the -−Z direction at a distance of L,then the reflection of a light beam on the first reflecting cathetussurface 211 will be earlier, the reflection of the light beam on thesecond reflecting cathetus surface 212 will be later, and the light beamexiting from the hypotenuse surface 213 will be shifted in the −Zdirection at a distance of 2L. However, if the first reflecting part 210is moved from the initial position to a second position in the +Zdirection at a distance of L, then the reflection of a light beam on thefirst reflecting cathetus surface 211 will be later, the reflection ofthe light beam on the second reflecting cathetus surface 212 will beearlier, and the light beam exiting from the hypotenuse surface 213 willbe shifted in the +Z direction at a distance of 2L. By repeatedly movingthe first reflecting part 210 along the Z axis parallel to thehypotenuse surface 213, the shaking (hand wobbling) along the Z axis canbe compensated and the image blurring can be suppressed.

Referring to FIG. 11B, the first reflecting cathetus surface 211, thesecond reflecting cathetus surface 212 and the hypotenuse surface 213are shown in solid lines when the first reflecting part 210 is in aninitial position. The first reflecting cathetus surface 211, the secondreflecting cathetus surface 212 and the hypotenuse surface 213 are shownin broken lines when the first reflecting part 210 is moved downwards(perpendicular to the hypotenuse surface 213, in a −X direction) at adistance L to a first position. If the first reflecting part 210 ismoved from the initial position to the first position in the −Xdirection at a distance of L, then the reflection of a light beam on thefirst reflecting cathetus surface 211 will be earlier, the reflection ofthe light beam on the second reflecting cathetus surface 212 will beearlier, and the light beam exiting from the hypotenuse surface 213 willbe shifted in the −X direction at a distance of 2L that produces aneffect to reduce the focal length. Thus, the focal length of the opticalsystem is reduced. However, if the first reflecting part 210 is movedfrom the initial position to a second position in the +X direction at adistance of L, then the reflection of a light beam on the firstreflecting cathetus surface 211 will be later, the reflection of thelight beam on the second reflecting cathetus surface 212 will be later,and the light beam exiting from the hypotenuse surface 213 will beshifted in the +X direction at a distance of 2L that produces an effectto increase the focal length. Thus, the focal length of the opticalsystem is increased. By repeatedly moving the first reflecting part 210along the X axis perpendicular to the hypotenuse surface 213, the focallength can be adjusted.

Referring to FIGS. 12A and 12B, a lens device 2100 in accordance with athird embodiment of the invention includes a first light path turningmodule, a first lens module 220 and an image sensor 230. In thisembodiment, the first light path turning module includes a firstreflecting part 210. In operation, a light beam passes through the firstlens module 220, enters the first reflecting part 210 through thehypotenuse surface 213, is reflected on the first reflecting cathetussurface 211, is reflected on the second reflecting cathetus surface 212,and leaves the first reflecting part 210 through the hypotenuse surface213 to form an image on the image sensor 230.

Referring to FIG. 12C, the first reflecting cathetus surface 211, thesecond reflecting cathetus surface 212 and the hypotenuse surface 213are shown in solid lines when the first reflecting part 210 is in aninitial position. The first reflecting cathetus surface 211, the secondreflecting cathetus surface 212 and the hypotenuse surface 213 are shownin broken lines when the first reflecting part 210 is moved rightwards(parallel to the hypotenuse surface 213, in a −Z direction) at adistance L to a first position. If the first reflecting part 210 ismoved from the initial position to the first position in the −Zdirection at a distance of L, then the reflection of a light beam on thefirst reflecting cathetus surface 211 will be earlier, the reflection ofthe light beam on the second reflecting cathetus surface 212 will belater, and the light beam exiting from the hypotenuse surface 213 willbe shifted in the −Z direction at a distance of 2L. However, if thefirst reflecting part 210 is moved from the initial position to a secondposition in the +Z direction at a distance of L, then the reflection ofa light beam on the first reflecting cathetus surface 211 will be later,the reflection of the light beam on the second reflecting cathetussurface 212 will be earlier, and the light beam exiting from thehypotenuse surface 213 will be shifted in the +Z direction at a distanceof 2L. By repeatedly moving the first reflecting part 210 along the Zaxis parallel to the hypotenuse surface 213, the shaking (hand wobbling)along the Z axis can be compensated and the image blurring can besuppressed.

Referring to FIG. 12D, the first reflecting cathetus surface 211, thesecond reflecting cathetus surface 212 and the hypotenuse surface 213are shown in solid lines when the first reflecting part 210 is in aninitial position. The first reflecting cathetus surface 211, the secondreflecting cathetus surface 212 and the hypotenuse surface 213 are shownin broken lines when the first reflecting part 210 is moved downwards(perpendicular to the hypotenuse surface 213, in a −X direction) at adistance L to a first position. If the first reflecting part 210 ismoved from the initial position to the first position in the −Xdirection at a distance of L, then the reflection of a light beam on thefirst reflecting cathetus surface 211 will be earlier, the reflection ofthe light beam on the second reflecting cathetus surface 212 will beearlier, and the light beam exiting from the hypotenuse surface 213 willbe shifted in the −X direction at a distance of 2L that produces aneffect to reduce the focal length. Thus, the focal length of the lensdevice is reduced. However, if the first reflecting part 210 is movedfrom the initial position to a second position in the +X direction at adistance of L, then the reflection of a light beam on the firstreflecting cathetus surface 211 will be later, the reflection of thelight beam on the second reflecting cathetus surface 212 will be later,and the light beam exiting from the hypotenuse surface 213 will beshifted in the +X direction at a distance of 2L that produces an effectto increase the focal length. Thus, the focal length of the lens deviceis increased. By repeatedly moving the first reflecting part 210 alongthe X axis perpendicular to the hypotenuse surface 213, the focal lengthcan be adjusted.

Referring to FIGS. 13A and 13B, a lens device 2200 in accordance with afourth embodiment of the invention includes a first light path turningmodule, a first lens module 220 and an image sensor 230. In thisembodiment, the first light path turning module includes a firstreflecting part 210 and a second reflecting part 240. In operation, alight beam passes through the first lens module 220, enters the firstreflecting part 210 through the hypotenuse surface 213, is reflected onthe first reflecting cathetus surface 211, is reflected on the secondreflecting cathetus surface 212, leaves the first reflecting part 210through the hypotenuse surface 213, and is reflected by the secondreflecting part 240 to form an image on the image sensor 230.

Referring to FIG. 13C, the first reflecting cathetus surface 211, thesecond reflecting cathetus surface 212 and the hypotenuse surface 213are shown in solid lines when the first reflecting part 210 is in aninitial position. The first reflecting cathetus surface 211, the secondreflecting cathetus surface 212 and the hypotenuse surface 213 are shownin broken lines when the first reflecting part 210 is moved rightwards(parallel to the hypotenuse surface 213, in a −Z direction) at adistance L to a first position. If the first reflecting part 210 ismoved rightwards from the initial position to the first position in the−Z direction at a distance of L, then the reflection of a light beam onthe first reflecting cathetus surface 211 will be earlier, and thereflection of the light beam on the second reflecting cathetus surface212 will be later. Then, the light beam enters the second reflectingpart 240 and is reflected on the second hypotenuse surface 243 of thesecond reflecting part 240 to the image sensor 230, and the light beamexiting from the second reflecting part 240 is shifted in the −Xdirection at a distance of 2L. However, if the first reflecting part 210is moved leftwards from the initial position to a second position in the+Z direction at a distance of L, then the reflection of a light beam onthe first reflecting cathetus surface 211 will be later, and thereflection of the light beam on the second reflecting cathetus surface212 will be earlier. Then, the light beam enters the second reflectingpart 240 and is reflected on the second hypotenuse surface 243 of thesecond reflecting part 240 to the image sensor 230, and the light beamexiting from the second reflecting part 240 is shifted in the +Xdirection at a distance of 2L. By repeatedly moving the first reflectingpart 210 along the Z axis parallel to the hypotenuse surface 213, theshaking (hand wobbling) along the Z axis can be compensated and theimage blurring can be suppressed.

Referring to FIG. 13D, the first reflecting cathetus surface 211, thesecond reflecting cathetus surface 212 and the hypotenuse surface 213are shown in solid lines when the first reflecting part 210 is in aninitial position. The first reflecting cathetus surface 211, the secondreflecting cathetus surface 212 and the hypotenuse surface 213 are shownin broken lines when the first reflecting part 210 is moved upwards(perpendicular to the hypotenuse surface 213, in a +X direction) at adistance L to a first position. If the first reflecting part 210 ismoved from the initial position to the first position in the +Xdirection at a distance of L, then the reflection of a light beam on thefirst reflecting cathetus surface 211 will be later, and the reflectionof the light beam on the second reflecting cathetus surface 212 will belater. Then, the light beam enters the second reflecting part 240 and isreflected on the second hypotenuse surface 243 of the second reflectingpart 240 to the image sensor 230, and the light beam exiting from thesecond reflecting part 240 is shifted in the +X direction at a distanceof 2L that produces an effect to increase the focal length. Thus, thefocal length of the lens device is increased. However, if the firstreflecting part 210 is moved from the initial position to a secondposition in the −X direction at a distance of L, then the reflection ofa light beam on the first reflecting cathetus surface 211 is earlier,and the reflection of the light beam on the second reflecting cathetussurface 212 is earlier. Then, the light beam enters the secondreflecting part 240 and is reflected on the second hypotenuse surface243 of the second reflecting part 240 to the image sensor 230, and thelight beam exiting from the second reflecting part 240 is shifted in the−X direction at a distance of 2L that produces an effect to reduce thefocal length. Thus, the focal length of the lens device 2200 is reduced.By repeatedly moving the first reflecting part 210 along the X axisperpendicular to the hypotenuse surface 213, the focal length can beadjusted.

In the fourth embodiment of the invention, the plane on which the imagesensor 230 is disposed is parallel to the optical axis of the first lensmodule 220. The second reflecting part may be a right angle prism.Further, the second reflecting part may include a reflecting mirror.That is, the hypotenuse surface is a reflecting mirror.

Referring to FIGS. 14A and 14B, a lens device 2300 in accordance with afifth embodiment of the invention includes a third reflecting part 250,a first lens module 220, an image sensor 230, a second reflecting part240 and a first reflecting part 210. In operation, a light beam isreflected by the third reflecting part 250 to the first lens module 220,passes through the first lens module 220, is reflected on the thirdreflecting cathetus surface 241 of the second reflecting part 240,enters the first reflecting part 210 through the first hypotenusesurface 213, is reflected on the first reflecting cathetus surface 211,is reflected on the second reflecting cathetus surface 212, leaves thefirst reflecting part 210 through the first hypotenuse surface 213, andis reflected on the fourth cathetus surface 240 of the second reflectingpart 240 to form an image on the image sensor 230. In the fifthembodiment, the first reflecting cathetus surface 211 and the thirdreflecting cathetus surface 241 are parallel to each other, the secondreflecting cathetus surface 212 and the fourth reflecting cathetussurface 242 are parallel to each other, and the first hypotenuse surface213 and the second hypotenuse surface 243 are parallel to each other.

Referring to FIG. 14C, the third reflecting cathetus surface 241, thefourth reflecting cathetus surface 242 and the second hypotenuse surface243 are shown in solid lines when the second reflecting part 240 is inan initial position. The third reflecting cathetus surface 241, thefourth reflecting cathetus surface 242 and the second hypotenuse surface243 are shown in broken lines when the second reflecting part 240 ismoved leftwards (parallel to the second hypotenuse surface 243, in a −Xdirection) at a distance L to a first position. If the second reflectingpart 240 is moved from the initial position to the first position in the−X direction at a distance of L, then the reflection of a light beam onthe third reflecting cathetus surface 241 will be earlier. Then, thelight beam enters the first reflecting part 210 through the firsthypotenuse surface 213, is reflected on the first reflecting cathetussurface 211, is reflected on the second reflecting cathetus surface 212,and exits from the first hypotenuse surface 213 towards the fourthreflecting cathetus surface 242, and the reflection of the light beam onthe fourth reflecting cathetus surface 242 becomes later. Thus, thelight beam exiting from the second reflecting part 240 is shifted in the−Z direction at a distance of 2L. However, if the second reflecting part240 is moved from the initial position to a second position in the +Xdirection at a distance of L, then the reflection of a light beam on thethird reflecting cathetus surface 241 will be later. Then, the lightbeam enters the first reflecting part 210 through the first hypotenusesurface 213, is reflected on the first reflecting cathetus surface 211,is reflected on the second reflecting cathetus surface 212, and exitsfrom the first hypotenuse surfaced 213 towards the fourth reflectingcathetus surface 242, and the reflection of the light beam on the fourthreflecting cathetus surface 242 becomes earlier. Thus, the light beamexiting from the second reflecting part 240 will be shifted in the +Zdirection at a distance of 2L. By repeatedly moving the secondreflecting part 240 along the X axis parallel to the second hypotenusesurface 243, the shaking (hand wobbling) can be compensated and theimage blurring can be suppressed.

Referring to FIG. 14D, the third reflecting cathetus surface 241, thefourth reflecting cathetus surface 242 and the second hypotenuse surface243 are shown in solid lines when the second reflecting part 240 is inan initial position. The third reflecting cathetus surface 241, thefourth reflecting cathetus surface 242 and the second hypotenuse surface243 are shown in broken lines when the second reflecting part 240 ismoved downwards (perpendicular to the second hypotenuse surface 243, ina −Z direction) at a distance L to a first position. If the firstreflecting part 210 is moved from the initial position to the firstposition in the −Z direction at a distance of L, then the reflection ofa light beam on the third reflecting cathetus surface 241 will be later.Then, the light beam enters the first reflecting part 210 through thefirst hypotenuse surface 213, is reflected on the first reflectingcathetus surface 211, is reflected on the second reflecting cathetussurface 212, and exits from the first hypotenuse surface 213 towards thefourth reflecting cathetus surface 242. Then, the reflection of thelight beam on the fourth reflecting cathetus surface 242 becomes later.Thus, the light beam exiting from the second reflecting part 240 will beshifted in the −X direction at a distance of 2L (i.e. where the image isformed is changed at a distance of 2L in the −X direction) that producesan effect to reduce the focal length. Thus, the focal length of the lensdevice 2300 is decreased. However, if the second reflecting part 240 ismoved upwards from the initial position to a second position in the +Zdirection at a distance of L, then the reflection of a light beam on thethird reflecting cathetus surface 241 will be earlier. Then, the lightbeam enters the first reflecting part 210 through the first hypotenusesurface 213, is reflected on the first reflecting cathetus surface 211,is reflected on the second reflecting cathetus surface 212, and exitsfrom the first hypotenuse surface 213 towards the fourth reflectingcathetus surface 242, and the reflection of the light beam on the fourthreflecting cathetus surface 242 becomes earlier. Thus, the light beamexiting from the second reflecting part 240 will be shifted in the +Xdirection at a distance of 2L (i.e. where the image is formed is changedat a distance of 2L in the +X direction) that produces an effect toincrease the focal length. Thus, the focal length of the lens device2300 is increased. By repeatedly moving the second reflecting part 240along the Z axis perpendicular to the second hypotenuse surface 243, thefocal length can be adjusted.

Referring to FIG. 14E, the third reflecting cathetus surface 241, thefourth reflecting cathetus surface 242 and the second hypotenuse surface243 are shown in solid lines when the second reflecting part 240 is inan initial position. The third reflecting cathetus surface 241, thefourth reflecting cathetus surface 242 and the second hypotenuse surface243 are shown in broken lines when the second reflecting part 240 isrotated about the Y axis clockwise at an angle θ to a first position(the Y axis is parallel to the third reflecting cathetus surface 241,the fourth reflecting cathetus surface 242 and the second hypotenusesurface 243). If the second reflecting part 240 is rotated clockwiseabout the Y axis at an angle θ from the initial position to the firstposition, then the reflection of a light beam on the third reflectingcathetus surface 241 will be earlier. Then, the light beam enters thefirst reflecting part 210 through the first hypotenuse surface 213, isreflected on the first reflecting cathetus surface 211, is reflected onthe second reflecting cathetus surface 212, and exits from the firsthypotenuse surface 213 towards the fourth reflecting cathetus surface242, and the reflection of the light beam on the fourth reflectingcathetus surface 242 becomes later. Thus, the light beam exiting fromthe second reflecting part 240 is shifted in the −Z direction at apredetermined distance. However, if the second reflecting part 240 isrotated about the Y axis counterclockwise at an angle θ from the initialposition to a second position, then the reflection of the light beam onthe third reflecting cathetus surface 241 will be later. Then, the lightbeam enters the first reflecting part 210 through the first hypotenusesurface 213, is reflected on the first reflecting cathetus surface 211,is reflected on the second reflecting cathetus surface 212, and exitsfrom the first hypotenuse surfaced 213 towards the fourth reflectingcathetus surface 242, and the reflection of the light beam on the fourthreflecting cathetus surface 242 becomes earlier. Thus, the light beamexiting from the second reflecting part 240 will be shifted in the +Zdirection at a predetermined distance. By repeatedly rotating the secondreflecting part 240 about the Y axis (the Y axis is parallel to parallelto the third reflecting cathetus surface 241, the fourth reflectingcathetus surface 242 and the second hypotenuse surface 243), the shaking(hand wobbling) can be compensated and the image blurring can besuppressed.

Referring to FIG. 14F, the first reflecting cathetus surface 211, thesecond reflecting cathetus surface 212 and the first hypotenuse surface213 are shown in solid lines when the first reflecting part 210 is in aninitial position. The first reflecting cathetus surface 211, the secondreflecting cathetus surface 212 and the first hypotenuse surface 213 areshown in broken lines when the first reflecting part 210 is movedrightwards (parallel to the first hypotenuse surface 213, in a +Xdirection) at a distance L to a first position, and the secondreflecting part 240 is stationary. In operation, the light beam comingfrom the first lens module 220 is reflected on the third reflectingcathetus surface 241 of the second reflecting part 240 and enters thefirst reflecting part 210 through the first hypotenuse surface 213. Ifthe first reflecting part 210 is rightwards moved from the initialposition to the first position in the +X direction at a distance of L,then the reflection of the light beam on the first reflecting cathetussurface 241 will be earlier and the reflection of the light beam on thesecond reflecting cathetus surface 212 will be later. Then, the lightbeam leaves the first hypotenuse surface 213, propagates towards thefourth reflecting cathetus surface 242, is reflected on the fourthreflecting cathetus surface 242, and leaves the second reflecting part240. The light beam exiting from the second reflecting part 240 will beshifted in the −Z direction at a distance of 2L. Similarly, inoperation, the light beam coming from the first lens module 220 isreflected on the third reflecting cathetus surface 241 of the secondreflecting part 240 and enters the first reflecting part 210 through thefirst hypotenuse surface 213. If the first reflecting part 210 is movedleftwards from the initial position to a second position in the −Xdirection at a distance of L, then the reflection of a light beam on thefirst reflecting cathetus surface 211 will be later and the reflectionof the light beam on the second reflecting cathetus surface 212 will beearlier. Then, the light beam exits from the first hypotenuse surface213, propagates towards the fourth reflecting cathetus surface 242, isreflected on the fourth reflecting cathetus surface 242, and leaves thesecond reflecting part 240. The light beam exiting from the secondreflecting part 240 will be shifted in the +Z direction at a distance of2L. By repeatedly moving the first reflecting part 210 along the X axisparallel to the first hypotenuse surface 213, the shaking (handwobbling) can be compensated and the image blurring can be suppressed.

Referring to FIG. 14G, the first reflecting cathetus surface 211, thesecond reflecting cathetus surface 212 and the first hypotenuse surface213 are shown in solid lines when the first reflecting part 240 is in aninitial position. The first reflecting cathetus surface 211, the secondreflecting cathetus surface 212 and the first hypotenuse surface 213 areshown in broken lines when the first reflecting part 210 is moveddownwards (perpendicular to the first hypotenuse surface 213, in a −Zdirection) at a distance L to a first position and the second reflectingpart 240 is stationary. In operation, the light beam coming from thefirst lens module 220 is reflected on the third reflecting cathetussurface 241 of the second reflecting part 240 and enters the firstreflecting part 210 through the first hypotenuse surface 213. If thefirst reflecting part 210 is moved downwards from the initial positionto the first position in the −Z direction at a distance of L, then thereflection of a light beam on the first reflecting cathetus surface 211will be earlier and the reflection of the light beam on the secondreflecting cathetus surface 212 will be earlier. Then, the light beamexits from the first hypotenuse surface 213, propagates towards thefourth reflecting cathetus surface 242, is reflected on the fourthreflecting cathetus surface 242, and leaves the second reflecting part240. The light beam exiting from the second reflecting part 240 will beshifted in the −X direction at a distance of 2L (i.e. where the image isformed is changed at a distance of 2L in the −X direction) that producesan effect to reduce the focal length. Thus, the focal length of the lensdevice 2300 is decreased. Similarly, in operation, the light beam comingfrom the first lens module 220 is reflected on the third reflectingcathetus surface 241 of the second reflecting part 240 and enters thefirst reflecting part 210 through the first hypotenuse surface 213. Ifthe second reflecting part 240 is moved upwards from the initialposition to a second position in the +Z direction at a distance of L,then the reflection of a light beam on the first reflecting cathetussurface 211 will be later, and the reflection of the light beam on thesecond reflecting cathetus surface 212 wil be later. Then, the lightbeam exits from the first hypotenuse surface 213, propagates towards thefourth reflecting cathetus surface 242, is reflected on the fourthreflecting cathetus surface 242, and leaves the second reflecting part240. The light beam exiting from the second reflecting part 240 will beshifted in the +X direction at a distance of 2L (i.e. where the image isformed is changed at a distance of 2L in the +X direction) that producesan effect to increase the focal length. Thus, the focal length of thelens device 2300 is increased. By repeatedly moving the first reflectingpart 210 along the Z axis perpendicular to the first hypotenuse surface213, the focal length can be adjusted.

From FIGS. 14C and 14F, it is concluded that the shaking (hand wobbling)can be compensated and the image blurring can be suppressed by using arelative motion between the first reflecting part 210 and the secondreflecting part 240 in a direction parallel to the hypotenuse surface.From FIGS. 14D and 14G, it is concluded that the focal length can beadjusted by using a relative motion between the first reflecting part210 and the second reflecting part 240 in a direction perpendicular tothe hypotenuse surface.

In the third, fourth and fifth embodiments of the invention, the firstreflecting part may be a right angle prism. Further, the firstreflecting part may include two reflecting mirrors. That is, the firstand second reflecting cathetus surfaces are reflecting mirrors.

In the fifth embodiment of the invention, the second reflecting part maybe a right angle prism. Further, the second reflecting part may includetwo reflecting mirrors. That is, the third and fourth reflectingcathetus surfaces are reflecting mirrors. The plane on which the imagesensor 230 is disposed is perpendicular to the optical axis of the firstlens module 220, and the first lens module 220 covers the plane whenobserved along the optical axis.

In the fourth embodiment of the invention, the plane on which the imagesensor 230 is disposed is parallel to the optical axis of the first lensmodule 220. In the fifth embodiment of the invention, the plane on whichthe image sensor 230 is disposed is perpendicular to the optical axis ofthe first lens module 220. It is understood that in some otherembodiments the plane and the optical axis are neither parallel norperpendicular to each other. Instead, the plane and the optical axis areoriented to have an angle therebetween and the angle is not equal to90°.

FIG. 15 is a schematic diagram showing the structure of a lens device3200 in accordance with the sixth embodiment of the invention. FIG. 16is a top view of the lens device 3200 of FIG. 15. FIG. 17 is a side viewof the lens module 3200 of FIG. 15. As shown in FIGS. 15-17, the lensdevice 3200 includes a base 3207, a third light path turning module 3201for changing propagation of a light beam from a second direction Y to afirst direction X by a reflection, a second lens module 3202 includingone or more lenses and having a second optical axis extended in thefirst direction X, a second light path turning module 3203 for changingpropagation of a light beam from the second direction Y to the firstdirection X by a reflection, and a first lens module 3204 including oneor more lenses and having a first optical axis extended in the firstdirection X. The third light path turning module 3201, the second lensmodule 3202, the second light path turning module 3203 and the firstlens module 3204 are sequentially disposed on the base 3207. The firstoptical axis and the second optical axis coincide. The lens device 3200further includes an image sensor 3205 for an image formed thereon. Thefirst optical axis of the first lens module 3204 is perpendicular to theplane on which the image sensor 3205 is disposed, and the first lensmodule 3204 partly covers the plane when observed in the first directionX.

The third light path turning module 3201 is configured to reflect alight beam coming from the second direction Y to the second lens module3203 wherein the first direction X is perpendicular to the seconddirection Y. The position of the second light path turning module 3203is switchable between a first position and a second position. That is,the second light path turning module 3203 is movable between the firstposition and the second position. The second light path turning module3203 staying in the first position is able to block the light beamcoming from the second lens module 3202. However, the second light pathturning module 3203 staying in the second position is away from thefirst optical axis and the second optical axis, allowing the light beamcoming from the second lens module 3202 to reach the first lens module3204. The third light path turning module 3201 may be a reflecting prismor a reflecting mirror. Similarly, the second light path turning module3203 may be a reflecting prism or a reflecting mirror.

In a selectable embodiment, the image sensor 3205 is disposed at thefirst optical axis. The light beam exiting from the first lens module3204 is directly projected onto the image sensor 3205 to form an image.

In another selectable embodiment, to achieve the optical zoom in highmagnification, miniaturization of module, and reduction of the length ofthe lens device 3200, the image sensor 3205 is not disposed at the firstoptical axis while a first light path turning module is disposed in thelight path and between the first lens module 3204 and the image sensor3205. The first light path turning module includes a first reflectingsurface configured to reflect the light beam coming from the second lensmodule 3202 or the first lens module 3204 to the image sensor 3205 forforming an image.

In yet another selectable embodiment, to achieve the optical zoom inhigh magnification, miniaturization of module, and reduction of thelength of the lens device 3200, the image sensor 3205 is not disposed atthe first optical axis while a first light path turning module 3206 isdisposed in the light path and between the first lens module 3204 andthe image sensor 3205. The first light path turning module 3206 includesa first reflecting part 32061 and a second reflecting part 32062arranged perpendicular to each other. The first reflecting part 32061 isdisposed at an angle of 45° from the second optical axis. The light beamcoming from the second lens module 3202 or the first lens module 3204 isreflected to the second reflecting part 32062 by the first reflectingpart 32061 and then reflected to the image sensor 3205 by the secondreflecting part 32062.

In the embodiments, the first reflecting part 32061 and the secondreflecting part 32062 may be unified to move together. The lens device3200 further includes a first directional driving unit (not shown) fordriving the first light path turning module 3206 to move in the firstdirection X, and a third directional driving unit (not shown) fordriving the first light path turning module 3206 to move in the thirddirection Z. The third direction Z is perpendicular to the firstdirection X and the second direction Y. A movement of the first lightpath turning module 3206 in the first direction X is able to change thelength of the path followed by the light beam for the lens device 3200thereby performing an auto focusing operation. A movement of the firstlight path turning module 3206 in the third direction Z is able tochange the position on the image sensor 3205 of the lens device 3200where an image is formed thereby performing an image stabilizationoperation (the length of the path followed by the light beam is alsochanged). In another embodiment of the invention, the lens device 3200does not include the third directional driving unit but the firstdirectional driving unit for only driving the first light path turningmodule 3206 to move in the first direction X. Alternatively, the lensdevice 3200 does not includes the first directional driving unit but thethird directional driving unit for only driving the first light pathturning module 3206 to move in the third direction Z.

In another embodiment of the invention, the first reflecting part 32061and the second reflecting part 32062 are independent from each other.The lens device 3200 further includes a first reflecting surface drivingunit (not shown) for driving the first reflecting part 32061 to move inthe third direction Z, and a second reflecting surface driving unit (notshown) for driving the second reflecting part 32062 to move in the thirddirection Z. The third direction Z is perpendicular to the firstdirection X and the second direction Y. By means of movement of thefirst reflecting part 32061 and the second reflecting part 32062 in thethird direction Z in accordance with the distance therebetween, the autofocusing and/or the image stabilization can performed.

FIG. 18 is a schematic diagram showing the structure of the lens device3200 of the invention wherein the second light path turning module 3203is in a second position. FIG. 19 is a top view of the lens device 3200of FIG. 18. FIG. 20 is a side view of the lens device 3200 of FIG. 18.As shown in FIGS. 15-20, when the second light path turning module 3203is in a first position, a light beam coming from the second direction Yenters the third light path turning module 3201, is reflected to thesecond lens module 3202, exits from the second lens module 3202, and isblocked by the second light path turning module 3203 in the firstposition. Also, another light beam coming from the second direction Yenters the second light path turning module 3203, is reflected to thefirst lens module 3204, exits from the first lens module 3204, and isreflected to the image sensor by the first light path turning module3206 to form an image. Under such circumstance, the magnification of thelens device 3200 is determined by the first lens module 3204.

When the second light path turning module 3203 is in a second position,a light beam coming from the second direction Y enters the third lightpath turning module 3201, is reflected to the second lens module 3202,exits from the second lens module 3202, propagates without being blockedby the second light path turning module 3203 in the second position,passes through the first lens module 3204, and is reflected to the imagesensor by the first light path turning module 3206 to form an image.Under such circumstance, the magnification of the lens device 3200 isdetermined by the second lens module 3202 and the first lens module3204.

Accordingly, the magnification of the lens device 3200 can be changed bymeans of movement of the second light path turning module 3203 betweenthe first position and the second position.

The movement of the second light path turning module 3203 between thefirst position and the second position can be performed by the followingstructure: The second light path turning module 3203 is provided with aslidable mechanism, while the base 3207 is provided with a guidingmechanism. Alternatively, the second light path turning module 3203 isprovided with a guiding mechanism, while the base 3207 is provided witha slidable mechanism. The slidable mechanism may be a slide or a roller.The guiding mechanism may be a guide groove cooperating with the slideor roller. The lens device 300 further includes a driving unit fordriving the second light path turning module 3203 to move to the secondposition or back to the first position in the third direction Z. Thedriving unit may includes a coil and a magnet, wherein the coil and themagnet are respectively disposed on the second light path turning module3203 and the base 3207, or the coil and the magnet are respectivelydisposed on the base 3207 and the second light path turning module 3203.

FIG. 21 is a schematic diagram showing a lens device 3200 in accordancewith a seventh embodiment of the invention, wherein the second lightpath turning module 3202 is in the second position. FIG. 22 is a topview of the lens device 3200 of FIG. 21. FIG. 23 is a side view of thelens device 3200 of FIG. 21. The descriptions of elements of the seventhembodiment identical to or similar with those of the sixth embodimentare omitted. The seventh embodiment differs from the sixth embodiment inthat the second light path turning module 3203 is not moved but rotatedto the second position or back to the first position.

Specifically, in the seventh embodiment, the second light path turningmodule 3203 is (preferably) a reflecting mirror rotatable about theupper side thereof. The rotational axis is parallel the third directionZ so that the reflecting mirror can be switched to be in the firstposition or the second position. In the second position, the secondlight path turning module 3203 is parallel to a first optical axis andis disposed above the first optical axis. The lens device 3200 furtherincludes a driving unit for driving the second light path turning module3203 to rotate about the rotational axis to the second position or backto the first position.

From the above descriptions, it is understood that the lens device ofthe invention is able to switch magnifications and to achieve theoptical zoom in high magnification and miniaturization of module.

FIG. 24 is a schematic diagram showing the structure of the primaryelements of a lens device 4200 in accordance with an eighth embodimentof the invention. As shown, the lens device 4200 includes a first lensmodule 4201 having an optical axis extended in the first direction X, afirst reflecting part 4202 receiving the light beam form the first lensmodule 4201 and reflecting the light beam, a second reflecting part 4203reflecting the light beam from the first reflecting part 4202 and beingdisposed opposite to the first reflecting part 4202 in the thirddirection Z, an image sensor 4204, and a third reflecting part 4205reflecting the light beam from the second reflecting part 4203 to theimage sensor 4204. The first reflecting part 4202, the second reflectingpart 4203 and the third reflecting part 4205 are disposed between thefirst lens module 4201 and the image sensor 4204 to form a first lightpart turning module.

The first reflecting part 4202 has a first reflecting surface 42021. Thesecond reflecting part 4203 has a second reflecting surface 42031. Thefirst reflecting surface 42021 is at 45° from the first direction X. Thefirst reflecting surface 42021 and the second reflecting surface 42031are perpendicular to each other. Further, the first reflecting surface42021 and the second reflecting surface 42031 are disposed opposite toeach other in the third direction Z. The third reflecting part 4205 hasa third reflecting surface 42051. The third reflecting surface 42051 isdisposed opposite to the second reflecting surface 42031 in the firstdirection X. Preferably, the third reflecting surface 42051 is parallelto the second reflecting surface 42031 and, however, the invention isnot limited thereto. It is understood that the third reflecting part canbe omitted and the image sensor 4204 can be disposed opposite to thesecond reflecting part 4203 so that the light beam reflected by thesecond reflecting part 4203 directly reaches the image sensor 4204without passing through the third reflecting part 4205. In theinvention, the term “opposite to” does not necessarily mean “parallelto” but “arranged in such way that the light beam passing through oneelement can reach another element”.

In the invention, the first reflecting part 4202, the second reflectingpart 4203 and the third reflecting part 4205 may be reflecting prisms orreflecting mirrors.

FIG. 25 is a schematic diagram showing the light path of the lens device4200 of the eighth embodiment of the invention. As shown, the light beampropagates in the first direction X, enters the first lens module 4201,exits from the first lens module 4201, reaches the first reflectingsurface 42021, is reflected on the first reflecting surface 42021,reaches the second reflecting surface 42031, is reflected on the secondreflecting surface 42031, reaches the third reflecting surface 42051, isreflected on the third reflecting surface 42051, and reaches the imagesensor 4204 to form an image.

FIG. 26 is a schematic diagram showing the light path of the lens device4200 of the eighth embodiment of the invention, in which the firstreflecting part 4202 and the second reflecting part 4203 are moved inopposite directions (i.e. the third direction Z and the oppositedirection thereof). In FIG. 26, the initial positions of the firstreflecting part 4202 and the second reflecting part 4203 are shown insolid lines, while the positions of the first reflecting part 4202 andthe second reflecting part 4203 after movement are shown in brokenlines. The first reflecting part 4202 is moved a distance L1 in thethird direction Z and the second reflecting part 4203 is moved adistance L2 in a direction opposite to the third direction Z so that thefirst reflecting part 4202 and the second reflecting part 4203 are awayfrom each other. Thus, the length of the path followed by the light beamis increased by ΔS=L1+L2 to perform the auto focusing operation of thelens device 4200, wherein L1 and L2 are positive numbers.

However, if the first reflecting part 4202 is moved a distance L1 in thethird direction Z and the second reflecting part 4203 is moved adistance L2 in a direction opposite to the third direction Z so that thefirst reflecting part 4202 and the second reflecting part 4203 arecloser to each other, then the length of the path followed by the lightbeam will be reduced by ΔS=L1+L2 to perform the auto focusing operationof the lens device 4200.

If L1=L2, then the light beam reflected by the second reflecting part4203 will propagate along the same optical path as the previous opticalpath (i.e. the optical path before the first reflecting part 4202 andthe second reflecting part 4203 are moved). Therefore, the image-formingposition on the image sensor 4204 is unchanged and the lens device 4200merely performs the auto focusing operation. If L1≠L2, then the lightbeam reflected by the second reflecting part 4203 will propagate alongan optical path different from the optical path before the firstreflecting part 4202 and the second reflecting part 4203 are moved.Therefore, the image-forming position on the image sensor 4204 isshifted at a distance S=|L1-L2|.

Specifically, in this embodiment, the first reflecting part 4202 and thesecond reflecting part 4203 can be moved in opposite directions (thethird direction Z and the opposite direction thereof) and away from eachother. If the distance L1 of movement of the first reflecting part 4202in the third direction Z is greater than the distance L2 of movement ofthe second reflecting part 4203 in a direction opposite to the thirddirection Z, then the image-forming position on the image sensor 4204will be shifted at a distance S=|L1-L2| in the first direction X.However, if the distance L1 of movement of the first reflecting part4202 in the third direction Z is less than the distance L2 of movementof the second reflecting part 4203 in a direction opposite to the thirddirection Z, then the image-forming position on the image sensor 4204will be shifted at a distance S=|L1-L2| in the direction opposite to thefirst direction X. Alternatively, the first reflecting part 4202 and thesecond reflecting part 4203 can be moved in opposite directions (thethird direction Z and the opposite direction thereof) and closer to eachother. If the distance L1 of movement of the first reflecting part 4202in the third direction Z is greater than the distance L2 of movement ofthe second reflecting part 4203 in a direction opposite to the thirddirection Z, then the image-forming position on the image sensor 4204will be shifted at a distance S=|L1-L2| in the direction opposite to thefirst direction X. However, if the distance L1 of movement of the firstreflecting part 4202 in the third direction Z is less than the distanceL2 of movement of the second reflecting part 4203 in the directionopposite to the third direction Z, then the image-forming position onthe image sensor 4204 will be shifted at a distance S=|L1-L2| in thefirst direction X.

By above arrangement, the lens device 4200 is able to perform autofocusing operation and compensation for hand wobbling.

FIG. 27 is a schematic diagram showing the light path of the lens device4200 of the eighth embodiment of the invention, in which the firstreflecting part 4202 and the second reflecting part 4203 are moved insame direction (i.e. the third direction Z or a direction opposite tothe third direction Z). In FIG. 27, the initial positions of the firstreflecting part 4202 and the second reflecting part 4203 are shown insolid lines, while the positions of the first reflecting part 4202 andthe second reflecting part 4203 after movement are shown in brokenlines. The first reflecting part 4202 is moved a distance L1 in thethird direction Z and the second reflecting part 4203 is moved adistance L2 also in the third direction Z so that the image formingposition on the image sensor 4204 is shifted at a distance S=L1+L2 toperform a compensation for hand wobbling, wherein L1 and L2 are positivenumbers.

In FIG. 27, if both of the first reflecting part 4202 and the secondreflecting part 4203 are moved in the third direction Z, then the imageforming position on the image sensor 4204 will be shifted in the firstdirection X. However, if both of the first reflecting part 4202 and thesecond reflecting part 4203 are moved in a direction opposite to thethird direction Z, then the image forming position on the image sensor4204 will be shifted in the direction opposite to the first direction X.

If L1=L2, then the image forming position on the image sensor 4204 willbe shifted at a distance S=L1+L2=2L1=2L2 and the length of path followedby the light beam will be unchanged. If L1≠L2, then the image-formingposition on the image sensor 4204 will be shifted at a distance S=L1+L2and the length of path followed by the light beam will be also changedin a difference ΔS=|L1-L2|.

Specifically, the first reflecting part 4202 and the second reflectingpart 4203 can be respectively moved distances L1 and L2 in the thirddirection Z. If L1>L2, then the length of path followed by the lightbeam will be increased in a difference ΔS=|L1-L2|. However, if L1<L2,then the length of path followed by the light beam will be reduced in adifference ΔS=|L1-L2|. Alternatively, the first reflecting part 4202 andthe second reflecting part 4203 can be respectively moved distance L1and L2 in a direction opposite to the third direction Z. If L1>L2, thenthe length of path followed by the light beam will be reduced in adifference ΔS=|L1-L2|. However, if L1<L2, then the length of pathfollowed by the light beam will be increased in a difference ΔS=|L1-L2|.

By above arrangement, the lens device 4200 is able to performcompensation for hand wobbling and auto focusing operation.

FIG. 28 is a schematic diagram showing anther structure of the primaryelements of a lens device 4200 in accordance with the eighth embodimentof the invention. FIG. 29 is a top view of the elements of the lensdevice 4200 of FIG. 28. FIG. 30 is an exploded diagram of the elementsof the lens device 4200 of FIG. 28. FIG. 31 is another exploded diagramof the elements of the lens device 4200 of FIG. 28. As shown in FIGS.28-31, the lens device 4200 further includes a base 4206 to which thefirst lens module 4201 and the third reflecting part 4205 are fixed, afirst reflecting part carrier 4207 configured to carry the firstreflecting part 4202 and movably disposed on the base 4206 to move inthe third direction Z, a second reflecting part carrier 4208 configuredto carry the second reflecting part 4203 and movably disposed on thebase 4206 to move in the third direction Z, and a cover 4209 connectedto the base 4206 to form a storage space for storing the above elements.The cover 4209 is provided with a hole 42091 allowing the light beam toenter the first lens module 4201.

For the movement of the first reflecting part 4202 and the secondreflecting part 4203 in the third direction Z, the base 4206 is providedwith a first guide groove 4211 and a second guide groove 4212 extendingin the third direction Z. For stabilization of the movement, the numberof the first guide groove 4211 and the second guide groove 4212 may beplural, and one of the first guide groove 4211 may be connected to oneof the second guide groove 4212 to form a longer guide groove. A firstmovable element 4213 is disposed on the bottom of the first reflectingpart carrier 4207 to cooperate with the first guide groove 4211, while asecond movable element 4214 is disposed on the bottom of the secondreflecting part carrier 4208 to cooperate with the second guide groove4212.

The first movable element 4213 includes a first receiving hole disposedat the bottom of the first reflecting part carrier 4207 and a firstroller disposed in the first receiving hole. The first roller is able toroll in the first receiving hole and the first guide groove 4211,thereby allowing the first reflecting part carrier 4207 to move in thethird direction Z. The second movable element 4214 includes a secondreceiving hole disposed at the bottom of the second reflecting partcarrier 4208 and a second roller disposed in the second receiving hole.The second roller is able to roll in the second receiving hole and thesecond guide groove 4212, thereby allowing the second reflecting partcarrier 4208 to move in the third direction Z. However, the invention isnot limited thereto. The first movable element 4213 and the secondmovable element 4214 may use other structure, for example, slidingblocks as substitutes.

To enhance the stabilization of movement, the cover 4209 is providedwith another first guide groove 4211 and another second guide groove4212 extending in the third direction Z. Another first movable element4213 is disposed on the top of the first reflecting part carrier 4207 tocooperate with the first guide groove 4211, while another second movableelement 4214 is disposed on the top of the second reflecting partcarrier 4208 to cooperate with the second guide groove 4212. Thestructure of the first movable element 4213 and the second movableelement 4214 are similar to that described in the previous paragraph andtherefore the descriptions thereof are omitted.

A first driving assembly 4215 is disposed between the cover 4209 and thefirst reflecting part carrier 4207. The first driving assembly 4215includes a magnet and a coil. The magnet is disposed on the cover 4209and the coil is disposed on the first reflecting part carrier 4207.Alternatively, the magnet is disposed on the first reflecting partcarrier 4207 and the coil is disposed on the cover 4209. When power isprovided, the first reflecting part carrier 4207 is driven by theelectromagnetic force to move in the third direction Z. A second drivingassembly 4216 is disposed between the cover 4209 and the secondreflecting part carrier 4208. The second driving assembly 4216 includesa magnet and a coil. The magnet is disposed on the cover 4209 and thecoil is disposed on the second reflecting part carrier 4208.Alternatively, the magnet is disposed on the second reflecting partcarrier 4208 and the coil is disposed on the cover 4209. When power isprovided, the second reflecting part carrier 4208 is driven by theelectromagnetic force to move in the third direction Z.

FIG. 32 is a schematic diagram showing the optical path of a lens device4300 in accordance with a ninth embodiment of the invention. As shown,the lens device 4300 includes a first lens module 4301 having an opticalaxis extended in the first direction X, a first reflecting part 4302, asecond reflecting part 4303 reflecting the light beam form the firstreflecting part 4302 and being disposed opposite to the first reflectingpart 4302 in the first direction X, an image sensor 4304, and a thirdreflecting part 4305 reflecting the light beam from the first lensmodule 4301 to the first reflecting part 4302 and reflecting the lightbeam from the second reflecting part 4303 to the image sensor 4304. Thefirst reflecting part 4302, the second reflecting part 4303 and thethird reflecting part 4305 are configured to form a first light partturning module.

The first reflecting part 4302 has a first reflecting surface 43021. Thesecond reflecting part 4303 has a second reflecting surface 43031. Thefirst reflecting surface 43021 is at 45° from the first direction X. Thefirst reflecting surface 43021 and the second reflecting surface 43031are perpendicular to each other. Further, the first reflecting surface43021 and the second reflecting surface 43031 are disposed opposite toeach other in the first direction X. The third reflecting part 4305 hasa third reflecting surface 43051 and a fourth reflecting surface 43052.The third reflecting surface 43051 is disposed opposite to the firstlens module 4301 in the first direction X and opposite to the firstreflecting surface 43021 in the third direction Z. The fourth reflectingsurface 43052 is disposed opposite to the second reflecting surface43031 in the third direction Z.

Preferably, the third reflecting surface 43051 is parallel to the firstreflecting surface 43021 and the fourth reflecting surface 43052 isparallel to the second reflecting surface 43031. However, the inventionis not limited thereto. It is understood that the fourth reflectingsurface 43052 can be omitted and the image sensor 4304 can be disposedopposite to the second reflecting part 4303 so that the light beamreflected by the second reflecting part 4303 directly reaches the imagesensor 4304 without passing through the fourth reflecting surface 43052.In the invention, the term “opposite to” does not necessarily mean“parallel to” but “arranged in such way that the light beam passingthrough one element can reach another element”.

In the invention, the first reflecting part 4302, the second reflectingpart 4303 and the third reflecting part 4305 may be reflecting prisms orreflecting mirrors.

In operation, the light beam propagates in the first direction X, entersthe first lens module 4301, exits from the first lens module 4301,reaches the third reflecting surface 43051, is reflected on the thirdreflecting surface 43051, reaches the first reflecting surface 43021, isreflected on the first reflecting surface 43021, reaches the secondreflecting surface 43031, is reflected on the second reflecting surface43031, reaches the fourth reflecting surface 43052, is reflected on thefourth reflecting surface 43052, and reaches the image sensor 4304 toform an image.

FIG. 33 is a schematic diagram showing the light path of the lens device4300 of the ninth embodiment of the invention, in which the firstreflecting part 4302 and the second reflecting part 4303 are moved inopposite directions (i.e. the first direction X and the oppositedirection thereof). In FIG. 33, the initial positions of the firstreflecting part 4302 and the second reflecting part 4303 are shown insolid lines, while the positions of the first reflecting part 4302 andthe second reflecting part 4303 after movement are shown in brokenlines. The first reflecting part 4302 is moved a distance L1 in thefirst direction X and the second reflecting part 4303 is moved adistance L2 in a direction opposite to the first direction X so that thefirst reflecting part 4202 and the second reflecting part 4203 are awayfrom each other. Thus, the length of the path followed by the light beamfrom the first lens module 4301 to the image sensor 4304 is increased byΔS=L1+L2 to perform the auto focusing operation of the lens device 4300,wherein L1 and L2 are positive numbers.

However, if the first reflecting part 4302 is moved a distance L1 in thefirst direction X and the second reflecting part 4303 is moved adistance L2 in a direction opposite to the first direction X so that thefirst reflecting part 4302 and the second reflecting part 4303 arecloser to each other, then the length of the path followed by the lightbeam from the first lens module 4301 to the image sensor 4304 will bereduced by A S=L1+L2 to perform the auto focusing operation of the lensdevice 4300.

If L1=L2, then the light beam reflected by the second reflecting part4303 will propagate along the same optical path as the previous opticalpath (i.e. the optical path before the first reflecting part 4202 andthe second reflecting part 4203 are moved). Therefore, the image-formingposition on the image sensor 4204 is unchanged and the lens device 4300merely performs the auto focusing operation. If L1≠L2, then the lightbeam reflected by the second reflecting part 4303 will propagate alongan optical path different from the optical path before the firstreflecting part 4202 and the second reflecting part 4203 are moved.Therefore, the image-forming position on the image sensor 4204 isshifted at a distance S=|L1-L2|.

Specifically, in this embodiment, the first reflecting part 4302 and thesecond reflecting part 4303 can be moved in opposite directions (i.e.the first direction X and the opposite direction thereof) and away fromeach other. If the distance L1 of movement of the first reflecting part4302 in the first direction X is greater than the distance L2 ofmovement of the second reflecting part 4303 in a direction opposite tothe first direction X, then the image-forming position on the imagesensor 4304 will be shifted at a distance S=|L1-L2| in the thirddirection Z. However, if the distance L1 of movement of the firstreflecting part 4302 in the first direction X is less than the distanceL2 of movement of the second reflecting part 4303 in a directionopposite to the first direction X, then the image-forming position onthe image sensor 4304 will be shifted at a distance S=|L1-L2| in thedirection opposite to the third direction Z. Alternatively, the firstreflecting part 4302 and the second reflecting part 4303 can be moved inopposite directions (the first direction X and the opposite directionthereof) and closer to each other. If the distance L1 of movement of thefirst reflecting part 4302 in the first direction X is greater than thedistance L2 of movement of the second reflecting part 4303 in adirection opposite to the first direction X, then the image-formingposition on the image sensor 4204 will be shifted at a distanceS=|L1-L2| in the direction opposite to the third direction Z. However,if the distance L1 of movement of the first reflecting part 4302 in thefirst direction X is less than the distance L2 of movement of the secondreflecting part 4303 in the direction opposite to the first direction X,then the image-forming position on the image sensor 4304 will be shiftedat a distance S=|L1-L2| in the third direction Z.

By above arrangement, the lens device 4300 is able to perform autofocusing operation and compensation for hand wobbling.

FIG. 34 is a schematic diagram showing the light path of the lens device4300 of the ninth embodiment of the invention, in which the firstreflecting part 4302 and the second reflecting part 4303 are moved insame direction (i.e. the first direction X or the direction opposite tothe first direction X). In FIG. 34, the initial positions of the firstreflecting part 4302 and the second reflecting part 4303 are shown insolid lines, while the positions of the first reflecting part 4302 andthe second reflecting part 4303 after movement are shown in brokenlines. The first reflecting part 4302 is moved a distance L1 in thefirst direction X and the second reflecting part 4303 is moved adistance L2 also in the first direction X so that the image formingposition on the image sensor 4304 is shifted at a distance S=L1+L2 toperform a compensation for hand wobbling, wherein L1 and L2 are positivenumbers.

In FIG. 34, if both of the first reflecting part 4302 and the secondreflecting part 4303 are moved in the direction opposite to the firstdirection X, then the image forming position on the image sensor 4304will be shifted in the third direction Z. However, if both of the firstreflecting part 4302 and the second reflecting part 4303 are moved inthe first direction X, then the image forming position on the imagesensor 4304 will be shifted in the direction opposite to the thirddirection Z.

If L1=L2, then the image forming position on the image sensor 4304 willbe shifted at a distance S=L1+L2=2L1=2L2 and the length of path followedby the light beam will be unchanged. If L1≠L2, then the image-formingposition on the image sensor 4304 will be shifted at a distance S=L1+L2and the length of path followed by the light beam will be also changedin a difference ΔS=|L1-L2|.

Specifically, the first reflecting part 4302 and the second reflectingpart 4303 can be respectively moved distances L1 and L2 in the firstdirection X. If L1>L2, then the length of path followed by the lightbeam will be increased in a difference ΔS=|L1-L2|. However, if L1<L2,then the length of path followed by the light beam will be reduced in adifference ΔS=|L1-L2|. Alternatively, the first reflecting part 4302 andthe second reflecting part 4303 can be respectively moved distance L1and L2 in a direction opposite to the first direction X. If L1>L2, thenthe length of path followed by the light beam will be reduced in adifference ΔS=|L1-L2|. However, if L1<L2, then the length of pathfollowed by the light beam will be increased in a difference ΔS=|L1-L2|.

By above arrangement, the lens device 4300 is able to performcompensation for hand wobbling and auto focusing operation.

In the ninth embodiment of the invention, the lens device 4300 furtherincludes a base to which the first lens module 4301 and the thirdreflecting part 4305 are fixed, a first reflecting part carrierconfigured to carry the first reflecting part 4302 and movably disposedon the base to move in the first direction X, a second reflecting partcarrier 4308 configured to carry the second reflecting part 4303 andmovably disposed on the base to move in the first direction X, and acover connected to the base to form a storage space for storing theabove elements. The cover is provided with a hole allowing the lightbeam to enter the first lens module 4301. The first reflecting partcarrier and the second reflecting part carrier of the ninth embodimentare the same as those of the eighth embodiment except the movementdirections thereof, and therefore the descriptions thereof are omitted.

FIGS. 35 and 36 depict a voice coil motor 510 in accordance with a tenthembodiment of the invention, wherein the voice coil motor 510 includes afirst light path turning module and a driving unit 5100.

The first light path turning module includes a first reflecting module5200 and a second reflecting module 5300. The second reflecting module5300 is configured to reflect the light beam coming from the firstreflecting module 5200.

The driving unit 5100 is configured to drive the first reflecting module5200 and the second reflecting module 5300 to move in the same directionor in opposite directions.

The driving unit 5100 includes a mount 5110, a first driving assembly5120 and a second driving assembly 5130. The first driving assembly 5120and the second driving assembly 5130 are configured to drive the firstreflecting module 5200 and the second reflecting module 5300 which aremovably disposed on the mount 5110. The first driving assembly 5120includes a first magnet 5122, a first printed circuit unit 5125 and afirst attracting yoke 5124. The first magnet 5122 is disposed on themount 5110 while the first printed circuit unit 5125 and the firstattracting yoke 5124 are disposed on the first reflecting module 5200.Alternatively, the first magnet 5122 is disposed on the first reflectingmodule 5200 while the first printed circuit unit 5125 and the firstattracting yoke 5124 are disposed on the mount 5110. The second drivingassembly 5130 includes a second magnet 5132, a second printed circuitunit 5135 and a second attracting yoke 5134. The second magnet 5132 isdisposed on the mount 5110 while the second printed circuit unit 5135and the second attracting yoke 5134 are disposed on the secondreflecting module 5300. Alternatively, the second magnet 5132 isdisposed on the second reflecting module 5300 while the second printedcircuit unit 5135 and the second attracting yoke 5134 are disposed onthe mount 5110.

As shown in FIG. 36, the voice coil motor 510 includes a driving unit5100, a first reflecting module 5200, a second reflecting module 5300and a frame 5400. The first reflecting module 5200 and the secondreflecting module 5300 are connected to the driving unit 5100. Thedriving unit 5100 can drive the first reflecting module 5200 and thesecond reflecting module 5300 to move in the same direction or inopposite directions. The frame 5400 is used for covering the drivingunit 5100 to provide an appearance of the voice coil motor 510.

As shown in FIG. 37, the first reflecting module 5200 includes a firstreflecting part 5210 and a first reflecting carrier 5220. The firstreflecting part 5210 has a first reflecting surface 5211. The secondreflecting module 5300 includes a second reflecting part 5310 and asecond reflecting carrier 5320. The second reflecting part 5310 has asecond reflecting surface 5311.

The first reflecting part 5210 and the second reflecting part 5310 aredisposed opposite to each other. Preferably, the first reflectingsurface 5211 and the second reflecting surface 5311 are perpendicular toeach other. In the invention, the term “opposite to” does notnecessarily mean “parallel to” but “arranged in such way that the lightbeam passing through one element can reach another element”.

In the invention, the first reflecting part 5210 and the secondreflecting part 5310 may be prisms, reflecting prisms or reflectingmirrors.

The first reflecting part 5210 is fixedly mounted on the firstreflecting carrier 5220. The relative position of the first reflectingpart 5210 is kept by the first reflecting carrier 5220. The secondreflecting part 5310 is fixedly mounted on the second reflecting carrier5320. The relative position of the second reflecting part 5310 is keptby the second reflecting carrier 5320.

As shown in FIGS. 38 and 39, the driving unit 5100 includes the mount5110, the first driving assembly 5120, the second driving assembly 5130,a shaft 5140 and a rear cover 5150.

The mount 5110 is open towards the first reflecting module 5200 and thesecond reflecting module 5300. That is, the mount 5110 has an openingtowards the first reflecting module 5200 and the second reflectingmodule 5300 for receiving the first reflecting carrier 5220 of the firstreflecting module 5200 and the second reflecting carrier 5320 of thesecond reflecting module 5300.

The first driving assembly 5120 is firmly connected to the firstreflecting carrier 5220 and is able to drive the first reflectingcarrier 5220 to move on the mount 5110. The second driving assembly 5130is firmly connected to the second reflecting carrier 5320 and is able todrive the second reflecting carrier 5320 to move on the mount 5110.

The first driving assembly 5120 includes a first stopper 5121, a firstmagnet 5122, a first slider mechanism 5123, a first attracting yoke 5124and a first printed circuit unit 5125. The first printed circuit unit5125 includes a first coil 51252. The second driving assembly 5130includes a second stopper 5131, a second magnet 5132, a second slidermechanism 5133, a second attracting yoke 5134 and a second printedcircuit unit 5135. The second printed circuit unit 5135 includes asecond coil 51352. In the invention, the first printed circuit unit 5125and the second printed circuit unit 5135 are integrally formed as acontinuous-unity piece. However, the invention is not limited thereto.The first printed circuit unit 5125 and the second printed circuit unit5135 can be two separated pieces.

As shown in FIGS. 40 and 41, the first slider mechanism 5123 and thefirst reflecting carrier 5220 are firmly connected. The second slidermechanism 5133 and the second reflecting carrier 5320 are firmlyconnected. The first slider mechanism 5123 and the second slidermechanism 5133 are slidably connected to the mount 5110. Specifically,the shaft 5140 is fixed to the mount 5110. The first slider mechanism5123 and the second slider mechanism 5133 are movably disposed aroundthe shaft 5140. Preferably, the shaft 5140 is made of magneticallynon-permeable material to avoid interfering the electromagnetic force ofthe driving unit 5100, thereby minimizing the optical deviation.

The first magnet 5122 and the first printed circuit unit 5125 provide amotive force for the first slider mechanism 5123 to move in the samedirection or in opposite directions. Similarly, the second magnet 5132and the second printed circuit unit 5135 provide a motive force for thesecond slider mechanism 5133 to move in the same direction or inopposite directions. Specifically, the first printed circuit unit 5125(the first coil 51252) and the second printed circuit unit 5135 (thesecond coil 51352) are provided with power to generate magnetic fields.The first magnet 5122 and the second magnet 5132 are pushed byelectromagnetic forces so as to drive the first slider mechanism 5123and the second slider mechanism 5133 to move along the shaft 5140 in thesame direction or in opposite directions. Thus, a lens device providedwith the voice coil motor 510 can perform the auto focusing operationand compensation for hand wobbling.

The first magnet 5122 is disposed on the mount 5110 while the firstprinted circuit unit 5125 (the first coil 51252) and the firstattracting yoke 5124 are disposed on the first reflecting carrier 5220.Alternatively, the first magnet 5122 is disposed on the first reflectingcarrier 5220 while the first printed circuit unit 5125 (the first coil51252) and the first attracting yoke 5124 are disposed on the mount5110. As shown in FIGS. 40 and 41, in this embodiment, the first magnet5122 is firmly disposed on the first slider mechanism 5123 while thefirst printed circuit unit 5125 (the first coil 51252) and the firstattracting yoke 5124 are disposed on the mount 5110.

The second magnet 5132 is disposed on the mount 5110 while the secondprinted circuit unit 5135 (the second coil 51352) and the secondattracting yoke 5134 are disposed on the second reflecting carrier 5320.Alternatively, the second magnet 5132 is disposed on the secondreflecting carrier 5320 while the second printed circuit unit 5135 (thesecond coil 51352) and the second attracting yoke 5134 are disposed onthe mount 5110. In this embodiment, the second magnet 5132 is firmlydisposed on the second slider mechanism 5133 as shown in FIG. 38, whilethe second printed circuit unit 5135 (the second coil 51352) and thesecond attracting yoke 5134 are disposed on the mount 5110.

The first attracting yoke 5124 and the second attracting yoke 5134 arefixed to the mount 5110 through the rear cover 5150. The first magnet5122 and the first attracting yoke 5124 attract each other. The secondmagnet 5132 and the second attracting yoke 5134 attract each other.Thus, the first reflecting carrier 5220 and the second reflectingcarrier 5320 can be tightly propped against the mount 5110 to ensurethat the first reflecting part 5210 and the second reflecting part 5310are perpendicular to the optical path.

Preferably, as shown in FIGS. 42 and 43, the first stopper 5121 and thesecond stopper 5131 are mounted on the mount 5110. The first magnet 5122and the first attracting yoke 5124 attract each other. The second magnet5132 and the second attracting yoke 5134 attract each other. Thus, thefirst reflecting carrier 5220 and the second reflecting carrier 5320 canbe tightly propped against the first stopper 5121 and the second stopper5131 to ensure that the first reflecting part 5210 and the secondreflecting part 5310 are perpendicular to the optical path, therebyobtaining a good image quality.

As shown in FIGS. 44 and 45, the first printed circuit unit 5125includes a first printed circuit board 51251, a first coil 51252, afirst driving chip 51253 and a first chip cooler 51254. The first coil51252 is printed on a surface of the first circuit board 51251 whereinthe surface faces the first magnet 5122. Preferably, in this embodiment,the first circuit board 51251 has nine layers of coil printed thereon.The first driving chip 51253 and the first chip cooler 51254 aredisposed on another surface of the first circuit board 51251.

The second printed circuit unit 5135 includes a second printed circuitboard 51351, a second coil 51352, a second driving chip 51353 and asecond chip cooler 51354. The second coil 51352 is printed on a surfaceof the second circuit board 51351 wherein the surface faces the secondmagnet 5132. Preferably, in this embodiment, the second circuit board51351 has nine layers of coil printed thereon. The second driving chip51353 and the second chip cooler 51354 are disposed on another surfaceof the second circuit board 51351.

The frame 5400 is connected to the mount 5110 to form a storage spacefor storing above described elements. The frame 5400 has an opening 5410allowing an entry of the light beam.

As shown in FIG. 46, a lens device of the eleventh embodiment includesthe voice coil motor 510, the second light path turning module 520, thefirst lens module 530 and the image sensor 540 of the tenth embodiment,wherein the second light path turning module 520 is configured toreceive and reflect a light beam coming from the object-side, and thefirst lens module 530 is configured to receive the light beam reflectedby the second light path turning module 520.

The voice coil motor 510 is disposed between the first lens module 530and the image sensor 540. In operation, the light beam passes throughthe first lens module 530 to the first reflecting module 5200, isreflected by the first reflecting module 5200 to the second reflectingmodule 5300, and is reflected by the second reflecting module 5300 tothe image sensor 540.

Specifically, the light beam from the object side propagates in thesecond direction, enters the second light path turning module 520, isreflected by the second light path turning module 520 to propagate inthe first direction, passes through the first lens module 530, reachesthe first reflecting module 5200, is reflected on the first reflectingsurface 5211 of the first reflecting module 5200 to propagate in thethird direction, reaches the second reflecting module 5300, is reflectedon the second reflecting surface 5311 to propagate in the firstdirection, and reaches the image sensor 540 to form an image.

The first lens module 530 has an optical axis oriented in the firstdirection, at least three lenses and a stop. At least one of the threelenses has positive refractive power (i.e. the focal length ispositive). The lens adjacent to the object side may have positiverefractive power and the object-side surface thereof may be convex. Atleast one of the three lenses has negative refractive power (i.e. thefocal length is negative). At least one of the three lenses has anon-circular outer circumferential portion. When the at least one of thelenses is observed along the optical axis thereof, the outercircumferential portion may be in shape of polygon, polygon with sidesarranged symmetrically with respect to the optical axis, lanes of trackand field, bottle, oak barrel, the upper half portion of red wine bottleor the like. The stop may be non-circular. When the stop is observedalong the optical axis thereof, the outer circumferential portion of thestop may be in shape of polygon, polygon with sides arrangedsymmetrically with respect to the optical axis, lanes of track andfield, bottle, oak barrel, the upper half portion of red wine bottle orthe like. Preferably, at least one lens and/or the stop of the lensdevice has a non-circular outer circumferential portion. Such a designfacilitates the reduction of dimensions, thickness and volume of thelens module and can effectively minimize the lens module. However, theinvention is not limited thereto. The lenses and the stop may becircular.

The described lens module has longer focal length and highermagnification for the optical zoom, is miniaturized with the dimensionsof the lens reduced, and can minimize the optical deviation by using thereflecting prisms and the shaft 5140.

As shown in FIG. 47, the invention provides a lens device including avoice coil motor 61, a second light path turning module 62, a first lensmodule 63, a connecting unit 64 and an image sensor (not shown). Thesecond light path turning module 62 is configured to receive and reflectthe light beam coming from the object side. The first lens module 63 isconfigured to receive the light beam reflected by the second light pathturning module 62. The voice coil motor 61 provides the functions ofauto focusing operation and image stabilization.

The connecting unit 64 is able to stabilize the connection of the firstlens module 63 and the voice coil motor 61 and to rapidly position thefirst lens module 63 at the voice coil motor 61. However, the inventionis not limited thereto. It is understood that the connecting unit 64 canbe omitted or replaced with another structure to function the same.

The image sensor is disposed near where the light beam exits from thesecond reflecting module 612. Specifically, the image sensor is disposedon a lateral wall of the voice coil motor 61 and the lateral wall isparallel to the third direction. The image sensor is configured toreceive the light beam reflected by the second reflecting module 612. Insome other embodiments, the image sensor is disposed near where thelight beam exits from the first reflecting module 611. That is, theimage sensor is disposed on another lateral wall of the voice coil motor61 and the lateral wall is parallel to the first direction.

The voice coil motor 61 is disposed between the first lens module 63 andthe image sensor. As shown in FIG. 48, the voice coil motor 61 includesa first light path turning module consisting of the first reflectingmodule 611 and the second reflecting module 612. The first reflecting isconfigured to receive the light beam from the first lens module 63 andreflect the light beam to the second reflecting module 612. The secondreflecting module 612 is configured to receive the light beam from thefirst reflecting module 611 and reflect the light beam to the imagesensor.

Specifically, the light beam from the object side propagates in thesecond direction, enters the second light path turning module 62, isreflected by the second light path turning module 62 to propagate in thefirst direction, passes through the first lens module 63, reaches thefirst reflecting module 611, is reflected by the first reflecting module611 to propagate in the third direction, reaches the second reflectingmodule 612, is reflected by the second reflecting module 612 topropagate in the first direction, and reaches the image sensor to forman image. In other words, the light beam from the object side propagatesin the second direction, is reflected by the second light path turningmodule 62 to propagate in the first direction, passes through the firstlens module 63, is reflected by the first reflecting module 611 topropagate in the third direction, is reflected by the second reflectingmodule 612 to propagate in the first direction, and reaches the imagesensor.

It is understood that the first lens module 63 has an optical axisoriented in the first direction, at least three lenses and a stop. Atleast one of the lenses has positive refractive power (i.e. the focallength is positive). The lens adjacent to the object side may havepositive refractive power and the object-side surface thereof may beconvex. At least one of the three lenses has negative refractive power(i.e. the focal length is negative). At least one of the three lenseshas a non-circular outer circumferential portion. When the lens isobserved along the optical axis thereof, the outer circumferentialportion may be in shape of polygon, polygon with sides arrangedsymmetrically with respect to the optical axis, lanes of track andfield, bottle, oak barrel, the upper half portion of red wine bottle orthe like. The stop may be non-circular. When the stop is observed alongthe optical axis thereof, the outer circumferential portion of the stopmay be in shape of polygon, polygon with sides arranged symmetricallywith respect to the optical axis, lanes of track and field, bottle, oakbarrel, the upper half portion of red wine bottle or the like.Preferably, at least one lens and/or the stop of the lens device has anon-circular outer circumferential portion. The design facilitates thereduction of dimensions, thickness and volume of the lens module and caneffectively minimize the lens module. However, the invention is notlimited thereto. The lenses and the stop may be circular.

As shown in FIGS. 48 and 49, the voice coil motor 61 in accordance withthe twelfth embodiment of the invention includes a frame 613, a rearcover 614, a first mount 615, a first reflecting module 611, a secondreflecting module 612 for reflecting the light beam from the firstreflecting module 611, and a first driving unit 5100 for driving thefirst reflecting module 611 and the second reflecting module 612 to moveon the first mount 615 in the same direction or in opposite directions.The first reflecting module 611 and the second reflecting module 612 areconnected to the mount 615 through at least one rolling unit 617. Therolling unit 617 may include a ball, a roller, a shaft or other partcapable of rolling.

The first mount 615 is substantially a hollow frame and the upper wallof the hollow frame has an opening to mount the first reflecting module611 and the second reflecting module 612.

The frame 613 and the rear cover 614 are connected to form a storagespace for storing the above elements and to provide an appearance of thevoice coil motor 61. The rear cover 614 is disposed at a side of theframe 613 near the first mount 615.

As shown in FIG. 49, the first reflecting module 611 and the secondreflecting module 612 is slidably mounted in the first mount 615. Thefirst reflecting module 611 includes a first reflecting part 6111 and afirst carrier 6112. The first reflecting part 6111 is mounted on thefirst carrier 6112. The second reflecting module 612 includes a secondreflecting part 6121 and a second carrier 6122. The second reflectingpart 6121 is mounted on the second carrier 6122. The first reflectingpart 6111 is disposed opposite to the second reflecting part 6122. Inthe invention, the term “opposite to” does not mean “parallel to andaligned with” but “arranged in such way that the light beam passingthrough one element can reach another element”. Preferably, thereflecting surfaces of the first reflecting part 6111 and the secondreflecting part 6121 are perpendicular to each other.

In the invention, the first reflecting part 6111 and the secondreflecting part 6121 may be prisms, reflecting prisms or reflectingmirrors. The first reflecting part 6111 is firmly mounted on the firstcarrier 6112 and the relative position of the first reflecting part 6111is kept by the first carrier 6112. The second reflecting part 6121 isfirmly mounted on the second carrier 6122 and the relative position ofthe second reflecting part 6121 is kept by the second carrier 6122.

Referring to FIGS. 48 and 50-52, the first carrier 6112 has at least onefirst receiving groove 6101 for the rolling unit 617 to roll thereinwhile the first mount 615 has at least one first guide groove 6201corresponding to the first receiving groove 6101 and extending in thedirection of movement of the first carrier 6112. Alternatively, thefirst mount 615 has the first receiving groove 6101 while the firstcarrier 6112 has the first guide groove 6201 corresponding to the firstreceiving groove 6101. The second carrier 6122 has at least one secondreceiving groove 6102 for the rolling unit 617 to roll therein while thefirst mount 615 has at least one second guide groove 6202 correspondingto the second receiving groove 6102 and extending in the direction ofmovement of the second carrier 6122. Alternatively, the first mount 615has the second receiving groove 6102 while the second carrier 6122 hasthe second guide groove 6202 corresponding to the second receivinggroove 6102.

As shown in FIGS. 48 and 50, in a preferred embodiment of the invention,the first carrier 6112 is provided with the first guide grooves 6201 onthe upper side and the lower side thereof. The section of the firstguide groove 6201 is substantially V-shaped to reduce the contact areawith the rolling unit 617. The second carrier 6122 is provided with thesecond guide grooves 6202 on the upper side and the lower side thereof.The section of the second guide groove 6202 is substantially V-shaped toreduce the contact area with the rolling unit 617. In some otherembodiment, the sections of the first guide groove 6201 and the secondguide groove 6202 may be curved, semicircular, or in other shapes.

Referring to FIGS. 49 and 51, in this embodiment, two first receivinggrooves 6101 are provided on the bottom wall of the first mount 615corresponding to the first guide groove 6201 disposed on the bottom sideof the first carrier 6112. Two second receiving grooves 6102 areprovided on the bottom wall of the first mount 615 corresponding to thesecond guide groove 6202 disposed on the bottom side of the secondcarrier 6122. Two first receiving grooves 6101 are provided on the topwall of the first mount 615 corresponding to the first guide groove 6201disposed on the top side of the first carrier 6112. Two second receivinggrooves 6102 are provided on the top wall of the first mount 615corresponding to the second guide groove 6202 disposed on the top sideof the second carrier 6122. It is worth noting that the number of thefirst receiving grooves 6101 and the second receiving grooves 6102depends on the number of the rolling units 617, and the number of therolling units 617 depends on the demand.

Referring to FIG. 52, in this embodiment, a plurality of first throughholes 6151 are provided on the first mount 615 corresponding to thefirst guide grooves 6201 of the first carrier 6112. T-shaped firstblocks 6153 are fitted into the first through holes 6151 to form thefirst receiving grooves 6101. Further, a plurality of second throughholes 6152 are provided on the first mount 615 corresponding to thesecond guide grooves 6202 of the second carrier 6122. T-shaped secondblocks 6154 are fitted into the second through holes 6152 to form thesecond receiving grooves 6102 for mounting the rolling unit 617. In someother embodiments, the first receiving grooves 6101 and the secondreceiving grooves 6102 can be replaced with blind holes, perforations oropenings directly formed on the first mount 615.

In operation, the rolling units 617 are kept in the first receivinggrooves 6101 and the second receiving grooves 6102 to rotate whenrolling along the first guide groove 6201 and the second guide groove6202. The rolling units 617 are provided to avoid the impacts during theprocess of overcoming the static frictional forces so that the operationis smooth.

Referring to FIGS. 48, 49 and 53, the first driving unit 616 includes afirst driving assembly 6161 for driving the first reflecting module 611and a second driving assembly 6162 for driving the second reflectingmodule 612.

The first driving assembly 6161 includes a first driving magnet 61611and a first attracting yoke 61613. The first driving magnet 61611 isdisposed on the rear over 614 while the first attracting yoke 61613 isdisposed on the first carrier 6112. Alternatively, the first drivingmagnet 61611 is disposed on the first carrier 6112 while the firstattracting yoke 61613 is disposed on the rear over 614. The seconddriving assembly 6162 includes a second driving magnet 61611 and asecond attracting yoke 61613. The second driving magnet 61611 isdisposed on the rear over 614 while the second attracting yoke 61613 isdisposed on the second carrier 6122. Alternatively, the second drivingmagnet 61611 is disposed on the second carrier 6122 while the secondattracting yoke 61613 is disposed on the rear over 614.

In this embodiment, the first driving magnet 61611 is disposed on a sideof the first carrier 6112 and the side faces the rear cover 614. Thesecond driving magnet 61621 is disposed on a side of the second carrier6122 and the side faces the rear cover 614. The first printed circuitunit 61612, the first attracting yoke 61613, the second printed circuitunit 61622 and the second attracting yoke 61623 are disposed on the rearcover 614. The first driving magnet 61611 and the first attracting yoke61613 attract each other. The second driving magnet 61621 and the secondattracting yoke 61623 attract each other. Therefore, the first carrier6112 and the second carrier 6122 are propped against the first mount 615to ensure that the first reflecting assembly 6111 and the secondreflecting assembly 6121 are perpendicular to the optical path.

In this embodiment, the first printed circuit unit 61612 and the secondprinted circuit unit 61622 are integrally formed as a continuous-unitypiece. However, the invention is not limited thereto. The first printedcircuit unit 61612 and the second printed circuit unit 61622 can be twoseparated pieces.

The first printed circuit unit 61612 includes a first coil and a firstcircuit board. The first coil is printed on a surface of the firstcircuit board wherein the surface faces the first driving magnet 61611.The second printed circuit unit 61622 includes a second coil and asecond circuit board. The second coil is printed on a surface of thesecond circuit board wherein the surface faces the second driving magnet61621. Specifically, the first coil of the first printed circuit unit61612 and the second coil of the second printed circuit unit 61622 areprovided with power to generate magnetic fields. The first drivingmagnet 61611 and the second driving magnet 61621 are pushed byelectromagnetic forces so as to drive the first carrier 6112 and thesecond carrier 6122 to move along the first guide groove 6201 and thesecond guide groove 6202 in the same direction or in oppositedirections. Thus, a lens device provided with the voice coil motor 61can perform the auto focusing operation and compensation for handwobbling.

The first printed circuit unit 61612 further includes a first drivingchip and a first chip cooler. The first coil is printed on a surface ofthe first circuit board wherein the surface faces the first drivingmagnet 61611. The first driving chip and the first chip cooler aredisposed on the other surface of the first circuit board. The secondprinted circuit unit 61622 further includes a second driving chip and asecond chip cooler. The second coil is printed on a surface of thesecond circuit board wherein the surface faces the second driving magnet61621. The second driving chip and the second chip cooler are disposedon the other surface of the second circuit board.

FIGS. 54-57 depict the thirteenth embodiment, which differs from thetwelfth embodiment in that the second light path turning module 62includes a third reflecting part 621 for receiving and reflecting theobject-side light beam, a third carrier 622 for carrying the thirdreflecting part 621, a second mount 623 for mounting the third carrier622, and a second driving unit 624 for driving the third carrier 622 torotate. The third carrier 622 is rotatable with respect to the secondmount 623 through a shaft 625. The third carrier 622 is firmly connectedto the shaft 625. The two ends of the shaft 625 are connected to thesecond mount 623.

The third reflecting part 621 may be a prism, a reflecting prism, areflecting mirror or the like.

Referring to FIG. 55, the third carrier 622 includes an inclined board6221. The inclined board 6221 has a surface facing upwards and the thirdreflecting part 621 is mounted on the surface. The third carrier 622further includes two side boards 6222 disposed on both sides of theinclined board 6221. Each of the side boards 6222 is provided with afixing hole 6223. The two ends of the shaft 625 are penetrated throughthe fixing holes 6223, firmly fitted, and protruded therefrom.

Referring to FIG. 55, the second mount 623 includes a bottom board 6231and two support boards 6232 extending upwards from the bottom board6231. The third carrier 622 is disposed between the two support boards6232. Each of the support boards 6232 is provided with a shaft hole 6233corresponding to the fixing hole 6223. The two ends of the shaft 625 arepenetrated through the shaft holes 6233 in such a way that the shaft 625is rotatable with respect to the support boards 6232.

Referring to FIGS. 54 and 55, the second driving unit 624 includes athird driving magnet 6241 and a third coil 6242. The third drivingmagnet 6241 is disposed on a side of the bottom board 6231 of the secondmount 623 wherein the side faces the third carrier 622, while the thirdcoil 6242 is disposed on the third carrier 622 at a locationcorresponding to where the third driving magnet 6241 is disposed.Alternatively, the third coil 6242 is disposed on a side of the bottomboard 6231 of the second mount 623 wherein the side faces the thirdcarrier 622, while the third driving magnet 6241 is disposed on thethird carrier 622 at a location corresponding to where the third drivingmagnet 6241 is disposed. As shown in FIGS. 55-57, for example, the thirdcoil 6242 is disposed on a side of the bottom board 6231 of the secondmount 623 wherein the side faces the third carrier 622, while the thirddriving magnet 6241 is disposed on the third carrier 622. In thisembodiment, as shown in FIG. 54, the third driving magnet 6241 isL-shaped and covers a corner of the third carrier 622 wherein the corneris near the third coil 6242.

After power is provided for the third coil 6242, a force is generatedbetween the third coil 6242 and the third driving magnet 6241 to rotatethe third carrier 622 backward and forwards within an angle about theshaft 625.

Two backstay elements 626 are provided at both ends of the shaft 625 andfixed to the support boards 6232 for supporting the shaft 625. Thebackstay elements 626 are shaped like slabs. The ends of the shaft 625have flat surfaces. The backstay elements 626 are fixed to the outersurfaces of the support boards 6232. A resistance-reducing structure 627is disposed between an end of the shaft 625 and a backstay element 626for reducing the frictional forces during rotation of the shaft 625.

Referring to FIG. 55 in some embodiments, the resistance-reducingstructure 627 is a ball-shaped structure independent from the shaft 625and the backstay element 626. Specifically, the ends of the shaft 625have flat surfaces. The backstay elements 626 are slab-shaped. The flatsurface of an end of the shaft 625 and the surface of a backstay element626 are respectively propped against both sides of a resistance-reducingstructure 627. The flat surface of the other end of the shaft 625 andthe surface of the other backstay element 626 are respectively proppedagainst both sides of the other resistance-reducing structure 627.

Referring to FIG. 56, in some other embodiments, the resistance-reducingstructure 627 is a hemispherical structure protruding from the backstayelement 626 towards the shaft 625. The two end surfaces of the shaft 625are flat, wherein one end surface is propped against theresistance-reducing structure 627 of the backstay element 626, and theother end surface is propped against the resistance-reducing structure627 of the other backstay element 626.

Referring to FIG. 57, in some other embodiments, each end of the shaft625 has a resistance-reducing structure 627 formed thereon. Theresistance-reducing structure 627 is a round head portion. The backstayelement 626 is planar. In FIG. 57, two backstays 626 are respectivelypropped against two resistance-reducing structures 627 at two ends ofthe shaft 625.

According to the above design, the resistance-reducing structures 627are provided between the two ends of the shaft 625 and the backstayelements 626 so that the frictional forces during rotation of the shaft625 can be reduced.

FIGS. 58 and 59 depict the fourteenth embodiment, which differs from thethirteenth embodiment in that at least two pairs of magnet elements arerespectively provided on the two support boards 6232 and the side boards6222 of the third carrier 622. Each pair of the magnet elements includesa first magnet 6100 and a second magnet 6200. The first magnet 6100 andthe second magnet 6200 are arranged with the same magnetic poles facingeach other. That is, the south magnetic pole of the first magnet 6100 isdisposed to face the south magnetic pole of the second magnet 6100, orthe north magnetic pole of the first magnet 6100 is disposed to face thenorth magnetic pole of the second magnet 6100.

By way of the repulsion of a pair of magnet element between the thirdcarrier 622 and the second mount 623, the axial runout of the thirdcarrier 622 during rotation about the shaft 625 in undesired directions(e.g. leftwards or rightwards) can be prevented, the optical imagestabilization (OIS) can be accurately performed, and the third carrier622 can be held on the second mount 623.

Referring to FIG. 58, in some embodiment, each support board 6232 of thesecond mount 623 has a first hole 6234 on a side thereof wherein theside of the support board 6232 faces the third carrier 622. The firstmagnet 6100 is fitted into the first hole 6234. The third carrier 622has a second hole 6224 on each side thereof and the second hole 6224 isdisposed at a location corresponding to where the first hole 6234 isdisposed. The second magnet 6200 is fitted into the second hole 6224.The first hole 6234 is formed on the support board 6232 and isindependent from the shaft hole 6233. Similarly, the second hole 6224 isformed on the side board 6222 of the third carrier 622 and isindependent from the shaft hole 6233.

Referring to FIG. 59, in some embodiment, a first counterbore 6235 isformed around the shaft hole 6233 on a side of each support board 6232which faces the third carrier 622. The first counterbore 6235 is not athrough hole while the shaft hole 6233 is a through hole. The shaft hole6233 is formed at the center of the first counterbore 6235. The firstcounterbore 6235 may be circular, triangular, rectangular, or in anyclosed shape. The first magnet 6100 is fitted into the first counterbore6235. The first magnet 6100 is provided with a through hole 6300allowing a penetration of the shaft 625. A second counterbore 6225 isformed around the fixing hole 6233 on a side of the third carrier 622which faces the support board 6232. The second counterbore 6225 is not athrough hole while the fixing hole 6223 is a through hole. The fixinghole 6223 is formed at the center of the second counterbore 6225. Thesecond magnet 6200 is fitted into the second counterbore 6225. Thesecond magnet 6200 is provided with a through hole 6300 allowing apenetration of the shaft 625.

While the invention has been described by way of example and in terms ofpreferred embodiment, it is to be understood that the invention is notlimited thereto. To the contrary, it is intended to cover variousmodifications and similar arrangements (as would be apparent to thoseskilled in the art). Therefore, the scope of the appended claims shouldbe accorded the broadest interpretation so as to encompass all suchmodifications and similar arrangements.

What is claimed is:
 1. A lens device, comprising: a first lens module; afirst light path turning module; and an image sensor; wherein the firstlens module, the first light path turning module and the image sensorare sequentially arranged along a light path in which a light beampropagates; wherein the first light path turning module is configured tochange a direction in which the light beam propagates so that the lightbeam passes through the first lens module to form an image on the imagesensor.
 2. The lens device as claimed in claim 1, further comprising asecond light path turning module, wherein: the first lens module has anoptical axis oriented in a first direction; the second light pathturning module is configured to receive the light beam propagates in asecond direction and to reflect the light beam to the first lens modulein the first direction; the first light path turning module is disposedbetween the first lens module and the image sensor, and comprises afirst prism unit and a second prism unit; the first prism unit comprisesa first surface, a second surface and a third surface; the light beam isincident into the first prism unit through the first surface; the secondsurface is disposed opposite to the image sensor; the light beam istotally reflected in the first prism unit and exits from the secondsurface; the second prism unit comprises a fourth surface and a fifthsurface, the fourth is disposed opposite to the first surface, and thefifth surface and the first surface are spaced.
 3. The lens device asclaimed in claim 1, wherein the first light path turning modulecomprises a first reflecting part and a second reflecting part, thefirst reflecting part is disposed between the first lens module and theimage sensor, the first reflecting part comprises a first reflectingcathetus surface, a second reflecting cathetus surface and a firsthypotenuse surface, the second reflecting part is disposed between thefirst reflecting part and the first lens module, the second reflectingpart comprises a third reflecting cathetus surface, a fourth reflectingcathetus surface and a second hypotenuse surface, the second reflectingpart is configured to move parallel to the second hypotenuse surface forcompensation for hand wobbling, and the second reflecting part isconfigured to move perpendicular to the second hypotenuse surface foradjustment of focal length of the lens device.
 4. The lens device asclaimed in claim 1, further comprising: a base; a third light pathturning module configured to reflect the light beam so that thedirection of propagation of the light beam is changed from a seconddirection to a first direction; a second light path turning moduleconfigured to reflect the light beam so that the direction ofpropagation of the light beam is changed from the second direction tothe first direction; a second lens module which is configured to receivethe light beam reflected by the third light path turning module and hasa second optical axis oriented in the first direction; a driving unit;wherein the first lens module is configured to receive the light beamreflected by the second light path turning module and has a firstoptical axis oriented in the first direction; wherein the first lightpath turning module is configured to reflected the light beam from thefirst lens module to the image sensor; wherein the third light pathturning module, the second lens module, the second light path turningmodule, the first lens module, the first light path turning module andthe image sensor are sequentially disposed on the base along the lightpath; wherein the second light path turning module is switched between afirst position and a second position, and the first direction and thesecond direction are perpendicular to each other; wherein the light beamfrom the second lens module is blocked by the second light path turningmodule when the second light path turning module is in the firstposition, and the second light path turning module is deviated from thesecond optical axis allowing the light beam from the second lens moduleto enter the first lens module when the second light path turning moduleis in the second position; wherein the driving unit is configured fordriving the second light path turning module to move in a thirddirection and to stay in the first position or the second position;wherein the first direction, the second direction and the thirddirection are perpendicular to each other.
 5. The lens device as claimedin claim 1, wherein: the first lens module has an optical axis orientedin a first direction; the first light path turning module comprises afirst reflecting part and a second reflecting part; the first reflectingpart is configured to receive and reflect the light beam passing throughthe first lens module; the first reflecting part is disposed between thefirst lens module and the image sensor and is movable in a thirddirection perpendicular to the first the second reflecting part isconfigured to reflect the light beam coming from the first reflectingpart; the second reflecting part is disposed between the first lensmodule and the image sensor and is movable along with the firstreflecting part in same or opposite directions.
 6. The lens device asclaimed in claim 1, wherein: the first lens module has an optical axisoriented in a first direction; the first light path turning modulecomprises a first reflecting part, a second reflecting part and a thirdreflecting part; the first reflecting part is configured to receive andreflect the light beam passing through the first lens module; the firstreflecting part is disposed between the first lens module and the imagesensor and is movable in the first direction; the second reflecting partis configured to reflect the light beam coming from the first reflectingpart; the second reflecting part is disposed between the first lensmodule and the image sensor and is movable along with the firstreflecting part in same or opposite direction; the third reflecting partis configured to reflect the light beam, coming from the firstreflecting part, to the first reflecting part; the third reflecting partis disposed between the first lens module and the image sensor.
 7. Thelens device as claimed in claim 1, further comprising a first reflectingmodule, a second reflecting module, a rolling unit and a first mount;wherein the first reflecting module comprises a first reflecting partand a first carrier, and the first reflecting part is disposed on thefirst carrier; wherein the second reflecting module comprises a secondreflecting part and a second carrier, and the second reflecting part isdisposed on the second carrier; wherein the rolling unit comprises aroller; wherein either the first carrier or the first mount has a firstreceiving groove for positioning the roller, the first carrier furtherhas a first guide groove extending in a direction of movement of thefirst carrier when the first mount has the first receiving groove, orthe first mount further has the first guide groove extending in thedirection of movement of the first carrier when the first carrier hasthe first receiving groove; wherein either the second carrier or thefirst mount has a second receiving groove for positioning the roller,the second carrier further has a second guide groove extending in adirection of movement of the second carrier and corresponding to thesecond receiving groove when the first mount has the second receivinggroove, or the first mount further has the second guide groove extendingin the direction of movement of the second carrier and corresponding tothe second receiving groove when the second carrier has the secondreceiving groove.
 8. The lens device as claimed in claim 1, furthercomprising a driving unit; wherein the first light path turning modulecomprises a first reflecting module and a second reflecting module;wherein the second reflecting module is configured to reflect the lightbeam coming from the first reflecting module; wherein the driving unitis configured to drive the first reflecting module and the secondreflecting module to move in same or opposite direction; wherein thedriving unit comprises a mount, a first driving assembly and a seconddriving assembly, and the first driving assembly and a second drivingassembly are configured to drive the first reflecting module and thesecond reflecting module which are movably disposed on the mount;wherein the first driving assembly comprises a first slider mechanism,and the first slider mechanism is firmly connected to the firstreflecting module; wherein the second driving assembly comprises asecond slider mechanism, and the second slider mechanism is firmlyconnected to the second reflecting module; wherein the first slidermechanism and the second slider mechanism are slidably connected to themount; wherein the driving unit further comprises a shaft firmlyconnected to the mount, and the first slider mechanism and the secondslider mechanism are disposed around the shaft.
 9. The lens device asclaimed in claim 8, wherein: the first driving assembly comprises afirst magnet, a first printed circuit unit and a first attracting yoke;the first magnet is disposed on the mount while the first printedcircuit unit and the first attracting yoke are disposed on the firstreflecting module; alternatively, the first magnet is disposed on thefirst reflecting module while the first printed circuit unit and thefirst attracting yoke are disposed on the mount; the second drivingassembly comprises a second magnet, a second printed circuit unit and asecond attracting yoke; the second magnet is disposed on the mount whilethe second printed circuit unit and the second attracting yoke aredisposed on the second reflecting module; alternatively, the secondmagnet is disposed on the second reflecting module while the secondprinted circuit unit and the second attracting yoke are disposed on themount; the first printed circuit unit comprises a first coil and a firstcircuit board, and the first coil is printed on a surface of the firstcircuit board opposite to the first magnet; the second printed circuitunit comprises a second coil and a second circuit board, and the secondcoil is printed on a surface of the second circuit the first printedcircuit unit comprises a first driving chip and a first chip coolermounted on another surface of the first circuit board; the secondprinted circuit unit comprises a second driving chip and a second chipcooler mounted on another surface of the second circuit board.
 10. Thelens device as claimed in claim 1, further comprising a second lightpath turning module, a second lens module and a driving unit; whereinthe second light path turning module is switched between a firstposition and a second position; wherein the second lens module has asecond optical axis oriented in the first direction; wherein the lightbeam from the second lens module is blocked by the second light pathturning module when the second light path turning module is in the firstposition, and the second light path turning module is deviated from thesecond optical axis allowing the light beam from the second lens moduleto enter the first lens module when the second light path turning moduleis in the second position; wherein the driving unit is configured torotate the second light path turning module to reach the first positionor the second position.
 11. The lens device as claimed in claim 1,further comprising a first mount, a first driving unit, two rollingunits and a second light path turning module, wherein: the first lightpath turning module comprises a first reflecting module and a secondreflecting module; the second reflecting module is configured to reflectthe light beam coming from the first reflecting module; the firstdriving unit is configured to drive the first reflecting module and thesecond reflecting module to move on the first mount in same or oppositedirections; the first reflecting module and the second reflecting moduleare connected to the first mount through the rolling units; the secondlight path turning module is configured to reflect the light beam froman object side and comprises a third reflecting part, a third carrier, asecond mount and a second driving unit; the third reflecting part isconfigured to reflect the light beam from an object side; the thirdcarrier is configured to carry the third reflecting part; the thirdcarrier is mounted on the second mount, is rotatable with respect to thesecond mount via a shaft, and is fixed to the shaft; the shaft comprisestwo ends connected to the second mount; the second driving unit isconfigured to drive the third carrier to rotate.
 12. The lens device asclaimed in claim 1, wherein: the first light path turning modulecomprises a plurality of reflecting parts configured to reflect thelight beam a plurality of times and to form the image on the imagesensor; the first lens module has an optical axis oriented in a firstdirection; the image sensor is disposed on a plane; the plane and theoptical axis are arranged in parallel or intersected at an anglediffering from ninety degrees.
 13. The lens device as claimed in claim1, wherein: the first light path turning module comprises a plurality ofreflecting parts configured to reflect the light beam a plurality oftimes and to form the image on the image sensor; the first lens modulehas an optical axis oriented in a first direction; the image sensor isdisposed on a plane; the plane and the optical axis are perpendicular toeach other; the first lens module partly or totally covers the imagesensor when observed in the first direction.
 14. The lens device asclaimed in claim 1, wherein: the first prism unit comprises a firstsurface, a second surface and a third surface; the light beam enters thefirst prism unit through the first surface, is totally reflected in thefirst prism unit at least three times, and leaves the first prism unitfrom the second surface and perpendicular to the second surface; thefirst surface is perpendicular to an optical axis of the first lensmodule, the first surface meets the second surface at a first angleranged from 42.75° to 47.25°,the second surface meets the third surfaceat a second angle ranged from 64.125° to 70.875°,and the first surfacemeets the third surface at a third angle ranged from 64.125° to 70.87515. The lens device as claimed in claim 1, wherein: the first light pathturning module comprises a first prism unit and a second prism unit; thefirst prism unit comprises a first surface, a second surface and a thirdsurface; the second prism unit comprises a fourth surface, a fifthsurface and a sixth surface; the fourth surface is disposed opposite tothe first lens module; the fifth surface and the first surface arespaced and disposed opposite to each other; the third surface is coatedwith a reflecting film and is inclined towards the lens module; thelight beam passes through the second prism unit and then the first prismunit, is totally reflected in the first prism unit, and leaves the firstprism unit from the second surface and perpendicular to the secondsurface; the second surface meets the third surface at a first angleranged from 85.5° to 94.5°,the first surface meets the second surface ata second angle ranged from 47.5° to 52.5°,the first surface meets thethird surface at a third angle ranged from 38° to 42°,the fourth surfacemeets the fifth surface at a fourth angle ranged from 28.5° to 31.5°,andthe fifth surface meets the sixth surface at a fifth angle ranged from57° to 63°.
 16. The lens device as claimed in claim 3, furthercomprising a first reflecting module, a second reflecting module, arolling unit and a first mount; wherein the first reflecting modulecomprises a first reflecting part and a first carrier, and the firstreflecting part is disposed on the first carrier; wherein the secondreflecting module comprises a second reflecting part and a secondcarrier, and the second reflecting part is disposed on the secondcarrier; wherein the rolling unit comprises a roller; wherein either thefirst carrier or the first mount has a first receiving groove forpositioning the roller, the first carrier further has a first guidegroove extending in a direction of movement of the first carrier whenthe first mount has the first receiving groove, or the first mountfurther has the first guide groove extending in the direction ofmovement of the first carrier when the first carrier has the firstreceiving groove; wherein either the second carrier or the first mounthas a second receiving groove for positioning the roller, the secondcarrier further has a second guide groove extending in a direction ofmovement of the second carrier and corresponding to the second receivinggroove when the first mount has the second receiving groove, or thefirst mount further has the second guide groove extending in thedirection of movement of the second carrier and corresponding to thesecond receiving groove when the second carrier has the second receivinggroove.
 17. The lens device as claimed in claim 6, further comprising afirst reflecting wherein the first reflecting module comprises a firstreflecting part and a first carrier, and the first reflecting part isdisposed on the first carrier; wherein the second reflecting modulecomprises a second reflecting part and a second carrier, and the secondreflecting part is disposed on the second carrier; wherein the rollingunit comprises a roller; wherein either the first carrier or the firstmount has a first receiving groove for positioning the roller, the firstcarrier further has a first guide groove extending in a direction ofmovement of the first carrier when the first mount has the firstreceiving groove, or the first mount further has the first guide grooveextending in the direction of movement of the first carrier when thefirst carrier has the first receiving groove; wherein either the secondcarrier or the first mount has a second receiving groove for positioningthe roller, the second carrier further has a second guide grooveextending in a direction of movement of the second carrier andcorresponding to the second receiving groove when the first mount hasthe second receiving groove, or the first mount further has the secondguide groove extending in the direction of movement of the secondcarrier and corresponding to the second receiving groove when the secondcarrier has the second receiving groove.
 18. The lens device as claimedin claim 3, further comprising a second light path turning module, asecond lens module and a driving unit; wherein the second light pathturning module is switched between a first position and a secondposition; wherein the second lens module has a second optical axisoriented in the first direction; wherein the light beam from the secondlens module is blocked by the second light path turning module when thesecond light path turning module is in the first position, and thesecond light path turning module is deviated from the second opticalaxis allowing the light beam from the second lens module to enter thefirst lens module when the second light path turning module is in thesecond position; wherein the driving unit is configured to rotate thesecond light path turning module to reach the first position or thesecond position.
 19. The lens device as claimed in claim 6, furthercomprising a second light path turning module, a second lens module anda driving unit; wherein the second light path turning module is switchedbetween a first position and a second position; wherein the second lensmodule has a second optical axis oriented in the first direction;wherein the light beam from the second lens module is blocked by thesecond light path turning module when the second light path turningmodule is in the first position, and the second light path turningmodule is deviated from the second optical axis allowing the light beamfrom the second lens module to enter the first lens module when thesecond light path turning module is in the second position; wherein thedriving unit is configured to rotate the second light path turningmodule to reach the first position or the second position.
 20. The lensdevice as claimed in claim 8, further comprising a second light pathturning module, a second lens module and a driving unit; wherein thesecond light path turning module is switched between a first positionand a second position; wherein the second lens module has a secondoptical axis oriented in the first direction; wherein the light beamfrom the second lens module is blocked by the second light path turningmodule when the second light path turning module is in the firstposition, and the second light path turning module is second lens moduleto enter the first lens module when the second light path turning moduleis in the second position; wherein the driving unit is configured torotate the second light path turning